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HSG80 Array Controller V8.7 Command Line Interface Reference Guide

CLI Command Descriptions

Displays information for all units known to the subsystem.

Syntax

SHOW UNITS

Parameters

There are no parameters associated with this command.

Switches

The following switch is available for the SHOW UNITS command:

•

FULL

Example

BOT> show units

    LUN                                      Uses             Used by

------------------------------------------------------------------

  D0                                         R0           

  D1                                         DISK10300    

  D2                                         M3           

  D3                                         S2

See Also

ADD UNITS
DELETE unit-number
SET unit-number
SHOW unit-number

SHOW UNITS

Summary of Contents for HSG80 - StorageWorks RAID Array Controller

Page 1: ...r V8 7 Command Line Interface Reference Guide Part Number EK G80CL RA B01 Second Edition August 2002 Product Version 8 7 This guide provides detailed descriptions of all CLI commands and step by step instructions on how to use each command ...

Page 2: ...he information contained in this document is subject to change without notice Microsoft MS DOS Windows and Windows NT are trademarks of Microsoft Corporation in the U S and or other countries All other product names mentioned herein may be trademarks of their respective companies Hewlett Packard Company shall not be liable for technical or editorial errors or omissions contained herein The informa...

Page 3: ...d Reseller viii 1 CLI Command Introduction CLI Overview 1 1 Using the CLI 1 1 Command Overview 1 2 Controller Commands 1 2 Device Commands 1 3 Selective Storage Presentation Commands 1 3 Storageset Commands 1 4 Partition Commands 1 4 Logical Unit Commands 1 5 Diagnostic and Utility Commands 1 5 Data Replication Manager DRM Commands 1 5 Getting Help 1 6 Entering CLI Commands 1 6 Command Syntax 1 7 ...

Page 4: ...iv HSG80 Array Controller V8 7 Command Line Interface Reference Guide Contents Glossary Index ...

Page 5: ...the text of this guide They have the following meanings WARNING Text set off in this manner indicates that failure to follow directions in the warning could result in bodily harm or loss of life Table 1 Document Conventions Element Convention Key names menu items buttons and dialog box titles Bold File names and application names Italics User input command names system responses output and message...

Page 6: ... of injury from electrical shock hazards do not open this enclosure Any RJ 45 receptacle marked with these symbols indicates a network interface connection WARNING To reduce the risk of electrical shock fire or damage to the equipment do not plug telephone or telecommunications connectors into this receptacle Any surface or area of the equipment marked with these symbols indicates the presence of ...

Page 7: ...ched to the rack In multiple rack installations the racks are coupled Only one rack component is extended at any time A rack may become unstable if more than one rack component is extended for any reason Getting Help If you still have a question after reading this guide contact service representatives or visit our website StorageWorks Technical Support In North America call StorageWorks technical ...

Page 8: ...orks website has the latest information on this product as well as the latest drivers Access the StorageWorks website at http www compaq com storage From this website select the appropriate product or solution StorageWorks Authorized Reseller For the name of your nearest StorageWorks Authorized Reseller In the United States call 1 800 345 1518 In Canada call 1 800 263 5868 Elsewhere see the Storag...

Page 9: ...uing CLI commands via the maintenance port of the controller is the most direct means of communicating with the controller The CLI commands allow you to manage the subsystem by viewing and modifying the configuration of the controller and the devices attached to them You can also use the CLI to start controller diagnostic and utility programs While the CLI provides the most detailed level of subsy...

Page 10: ... can perform Command Overview CLI commands are divided into categories based on the options or structures they control The following sections list these command categories Controller Commands Controller commands configure the maintenance terminal characteristics CLI prompt and so forth These commands are also used to shut down and restart the controller There are two types of controller commands g...

Page 11: ...LOCATE RENAME SET The CLI commands that support sparesets and failedsets include ADD SPARESET DELETE FAILEDSET DELETE SPARESET SET FAILEDSET SHOW FAILEDSET Selective Storage Presentation Commands Selective Storage Presentation commands enable or disable access to individually selected units from host and controller ports Paths can be enabled or disabled either all inclusively or specifically on a ...

Page 12: ... from groups of device containers These commands group device containers together and allow them to be handled as single units There are four types of storagesets stripesets RAIDsets striped mirrorsets and mirrorsets The CLI commands that pertain to storagesets include ADD MIRRORSET ADD RAIDSET ADD STRIPESET DELETE INITIALIZE LOCATE MIRROR REDUCE RENAME SET SHOW UNMIRROR Partition Commands Partiti...

Page 13: ... achieve data replication HSG80 controller pairs at the initiator site are connected to a partner HSG80 controller pair at the target site Remote copy sets are created from units at the initiator and target sites These remote copy sets are mirrors of each other The HSG80 controllers provide failover and failback capabilities in case of failures Failover makes the data available at the target site ...

Page 14: ...used with the SET THIS_CONTROLLER command enter SET THIS_CONTROLLER To see what is allowed for a prompt enter the following SET THIS PROMPT Entering CLI Commands Use the following tips and techniques for the entering of CLI commands Commands are not case sensitive For most commands only enter enough of the command to make the command unique For example SHO is the same as entering SHOW The controll...

Page 15: ... Arrow key or Ctrl F keys Moves the cursor left or right in a command line Ctrl E keys Moves the cursor to the end of the line Ctrl H keys Moves the cursor to the beginning of the line Ctrl J keys or Linefeed key Deletes the word to the left of the cursor Ctrl U keys Deletes all characters on the same line as the cursor Ctrl A keys or F14 key Toggles between insert and overstrike mode The default ...

Page 16: ...or phrases that supply necessary information to support the action of the COMMAND Note that not all CLI commands require parameters Parameters are represented in this guide as lowercase italicized text SWITCHES An optional word or phrase that modifies the command parameter string Not all CLI commands require switches Switches are represented in this guide as capitalized italicized text Changing th...

Page 17: ... of each command available on the CLI interface CLI Command Descriptions This section contains the descriptions of the available CLI commands used with the ACS versions 8 7F 8 7G 8 7P and 8 7S software Each command is described using the following format Command name and brief description Syntax needed to enable command Parameters needed if any to further specify the command Switches needed if any...

Page 18: ...mmand is valid only on the node on which the Initiator resides where remote copy sets are configured This command is rejected if the specified remote copy set is unknown to the controller pair Syntax ADD ASSOCIATIONS association set name Parameters The following parameters are required for the ADD ASSOCIATIONS command association set name The association set name may consist of a maximum of nine p...

Page 19: ...HSG80 Array Controller V8 7 Command Line Interface Reference Guide 2 3 ADD ASSOCIATIONS See Also ADD REMOTE_COPY_SETS SET association set name SHOW ASSOCIATIONS SHOW association set name ...

Page 20: ...one of its disks increasing in size use of this command could make data inaccessible Syntax ADD CONCATSETS concatset name storageset name Parameters The following parameters are required for the ADD CONCATSETS command concatset name storageset name These parameters are described in the following paragraphs concatset name The name to be assigned to the concatenation or concatset The concatset name ...

Page 21: ... ADD CONCATSETS Examples To convert unit D0 which consists of stripeset STRIPE1 to a concatset enter ADD CONCATSETS C1 STRIPE1 To add STRIPE2 to the concatset C1 enter SET C1 ADD STRIPE2 See Also DELETE concatset name SET concatset name SHOW CONCATSETS SHOW concatset name ...

Page 22: ...n and adds it to the table The controller assigns a default connection name to new connections that are discovered through the physical connection The default connection name is of the form NEWCONnn NOTE Certain host conditions such as a power cycle that disturb the state of the switched fabric may cause a connection to reappear in the table The connection is assigned a default connection name Add...

Page 23: ...eter name must be entered followed by an equal sign followed by the WWN of the host For example to specify a WWN of AAAA BBBB CCCC DDDD enter HOST_ID AAAA BBBB CCCC DDDD ADAPTER_ID adapter id ADAPTER_ID is the parameter name for the adapter id variable which is the worldwide name WWN of the host Fibre Channel adapter WWN is a 16 character hexadecimal number The hyphens are not necessary but are re...

Page 24: ...e to force the connection into an online state issue the following command CLI SET THIS OTHER PORT_ 1 2 _TOPOLOGY OFFLINE followed by CLI SET THIS OTHER PORT_ 1 2 _TOPOLOGY FABRIC This forces all hosts connected to that controller port to re login Additionally hosts connected to the controller pair through the same switch regardless of controller port re login as well CAUTION This implementation i...

Page 25: ...port on which it is received thereby limiting the host access to those paths that have been explicitly reserved IMPORTANT If a particular host prefers either the CONNECTION_BASED or HBA_PORT_ID_BASED reservation style all the connections to that particular host must have identical reservation style settings The most important advantage of this mechanism is that it allows various hosts with differe...

Page 26: ...t assignments are as follows Server1 accesses units D0 through D7 which it sees as LUNs 0 through 7 Server2 accesses units D10 through D17 which it sees as LUNs 0 through 7 Server3 accesses units D120 through D127 which it sees as LUNs 0 through 7 There is one additional factor to consider when assigning unit numbers and offsets If the SCSI_VERSION qualifier of the SET THIS OTHER CONTROLLER comman...

Page 27: ...HSG80 Array Controller V8 7 Command Line Interface Reference Guide 2 11 ADD CONNECTIONS See Also DELETE connection name SET connection name RENAME SHOW connection name SHOW CONNECTIONS ...

Page 28: ... the ADD DISKS command disk name scsi port target lun These parameters are described in the following paragraphs disk name Assigns a name to the disk device This disk name can then be used with the ADD UNITS command to create a logical unit or a parameter in the adding of a storageset The disk name may consist of a maximum of nine printable characters excluding commas and back slashes A disk drive...

Page 29: ...REQUESTED 5MHZ Specifies the maximum data transfer rate at which the controller is to communicate with the disk drive The transfer rate might need to be limited to accommodate long cables between the controllers and the device TRANSPORTABLE NOTRANSPORTABLE default Indicates whether a disk drive can be accessed exclusively by StorageWorks controllers or can be used by non StorageWorks systems TRANS...

Page 30: ...K10000 at port 1 target 0 LUN 0 enter ADD DISKS DISK10000 1 0 0 To add DISK40200 as a transportable disk drive to port 4 target 2 LUN 0 enter ADD DISKS DISK40200 4 2 0 TRANSPORTABLE To add a disk drive named DISK30200 as a non transportable disk to port 3 target 2 LUN 0 and set the data transfer rate to 10 MHz enter the following on one line ADD DISKS DISK30200 3 2 0 NOTRANSPORTABLE TRANSFER_RATE_...

Page 31: ...gns a name to the mirrorset container This is the name used with the ADD UNITS command to identify the mirrorset as a host addressable unit The mirrorset name may consist of a maximum of nine printable characters excluding commas and back slashes A mirrorset is commonly named MIRRn where n is a sequentially assigned unique identifier Other naming conventions are acceptable but this naming conventi...

Page 32: ...POLICY BEST_FIT to choose a replacement disk drive from the spareset that equals or exceeds the base member size smallest disk drive at the time the mirrorset was initialized If there is more than one disk drive in the spareset that meets the criteria the controller selects a disk drive with the best performance Specify POLICY BEST_PERFORMANCE to allow the software to choose a replacement disk dri...

Page 33: ...READ_SOURCE ROUND_ROBIN to sequentially direct read requests to each local mirrorset disk The controller equally queries all normal disks for each read request Examples To create a mirrorset named MIRR1 consisting of disks DISK10000 DISK20100 and DISK30200 enter ADD MIRRORSETS MIRR1 DISK10000 DISK20100 DISK30200 To create a host addressable unit after the mirrorset MIRR1 has been created enter INI...

Page 34: ... ADD PASSTHROUGH command passthrough name scsi port target lun These parameters are described in the following paragraphs passthrough name Assigns a name to the passthrough device This container name is then used with the ADD UNITS command to create a logical unit The passthrough name may consist of a maximum of nine printable characters excluding commas and back slashes A passthrough device is co...

Page 35: ...witch is available with the ADD PASSTHROUGH command TRANSFER_RATE_REQUESTED These switches are described in the following paragraphs TRANSFER_RATE_REQUESTED ASYNCHRONOUS TRANSFER_RATE_REQUESTED DEFAULT TRANSFER_RATE_REQUESTED 20MHZ default TRANSFER_RATE_REQUESTED 10MHZ TRANSFER_RATE_REQUESTED 5MHZ Specifies the maximum data transfer rate at which the controller is to communicate with the passthrou...

Page 36: ...y on each 9 GB member A RAIDset must include at least 3 disk drives but no more than 14 Syntax ADD RAIDSETS RAIDset name disk name1 disk name2 disk name3 disk nameN Parameters The following parameters are available to the ADD RAIDSETS command RAIDset name disk name These parameters are described in the following paragraphs RAIDset name Assigns a name to the RAIDset This is the name used with the A...

Page 37: ...of the RAIDset The controller attempts to select a disk on a different port than existing RAIDset members If there is more than one disk drive in the spareset matching the best performance criteria the controller selects a disk drive that equals or exceeds the base member size of the RAIDset Specify NOPOLICY to prevent the controller from automatically replacing a failed disk device This RAIDset o...

Page 38: ...mples To create a RAIDset named RAID9 that contains disks DISK10000 DISK20100 and DISK30200 enter ADD RAIDSETS RAID9 DISK10000 DISK20100 DISK30200 To create a RAIDset named RAID8 that contains disks DISK10000 DISK20100 and DISK30200 and uses the BEST_FIT switch to indicate the replacement policy enter ADD RAIDSETS RAID8 DISK10000 DISK20100 DISK30200 POLICY BEST_FIT NOTE Enter the ADD RAIDSETS comm...

Page 39: ...HSG80 Array Controller V8 7 Command Line Interface Reference Guide 2 23 ADD RAIDSETS See Also ADD UNITS DELETE container name INITIALIZE SET RAIDSETS SHOW RAIDSETS SHOW RAIDset name SHOW STORAGESETS ...

Page 40: ...2 remote copy sets per initiator target pair Neither initiator nor target units can be transportable units concatset units or snapshot units Syntax ADD REMOTE_COPY_SETS remote copy set name initiator unit name remote node name target unit name Parameters The parameters required for this command are remote copy set name initiator unit name remote node name target unit name this parameter is not req...

Page 41: ...al operating modes is assigned to the remote copy set In synchronous mode write operations must be completed on the remote units of the remote copy set before the host is informed that the operation is complete Synchronous operation assures data consistency at all times among the members of a remote copy set In asynchronous mode the write operation is reported as complete to the host before the da...

Page 42: ...n be reported as completed to the host before they have been written on all the members of the remote copy set Example To create remote copy set RCS1 consisting of unit D1 on the local controller pair and unit D21 on a remote controller pair node named London enter ADD REMOTE_COPY_SETS RCS1 D1 LONDON D21 See Also ADD ASSOCIATIONS SET controller REMOTE_COPY SET remote copy set name ...

Page 43: ...d snapshot unit storageset name source unit The relationship of the parameters can be summarized as follows When the ADD SNAPSHOT_UNITS command is entered storageset name becomes snapshot unit and archives the current contents of source unit at that instant These parameters are described in the following paragraphs snapshot unit The unit number assigned to the snapshot unit See the ADD UNITS comma...

Page 44: ...ith the ADD SNAPSHOT_UNITS command USE_PARENT_WWID This switch causes the snapshot unit to be created with a special WWID derived from that of the parent source unit If the special WWID for the specified source unit is in use then a new WWID is automatically allocated and a warning message is displayed NOTE The use of this switch limits the number of WWIDs that an operating system needs to track T...

Page 45: ...ers Syntax ADD SPARESETS disk name Parameters disk name Indicates the name of the disk drive being added to the spareset Only one disk drive can be added to the spareset with each ADD SPARESETS command Switches There are no switches associated with this command Example To add disk drives named DISK20200 and DISK30300 to a spareset enter ADD SPARESETS DISK20200 ADD SPARESETS DISK30300 See Also DELE...

Page 46: ...IPESETS command stripeset name container name These parameters are described in the following paragraphs stripeset name Assigns a name to the stripeset This is the name used with the ADD UNITS command to identify the stripeset as a host addressable unit The stripeset name may consist of up to nine characters excluding commas and back slashes It is common to name a stripeset STRIPEn where n is a se...

Page 47: ... enter INITIALIZE STRIPE1 ADD UNITS D103 STRIPE1 To create a two member striped mirrorset a stripeset whose members are mirrorsets and a logical unit from it enter NOTE Because you can initialize the stripeset you do not need to individually initialize the mirrorset members ADD MIRRORSETS MR1 DISK10000 DISK20100 ADD MIRRORSETS MR2 DISK30200 DISK40300 ADD STRIPESETS STRIPE1 MR1 MR2 INITIALIZE STRIP...

Page 48: ...the container must be initialized in order to be added as a logical unit If adding a container with previously stored data that needs to be maintained do not initialize this container the container is added as a logical unit CAUTION Adding a unit immediately makes that unit available to all host connections unless the DISABLE_ACCESS_PATH switch is specified See the ENABLE_ACCESS_PATH DISABLE_ACCES...

Page 49: ...ver mode adding unit D0 creates a logical unit that is presented to both ports on both controllers What hosts can see the unit is determined by parameters of the ADD CONNECTIONS command and by the ENABLE DISABLE_ACCESS_PATH switch of the ADD UNITS command Refer to the detailed description of failover modes that are contained in the controller installation and configuration guide for further inform...

Page 50: ...ies which switches may be used with each type of device or storageset Descriptions of each switch follow the table Table 2 1 ADD UNITS Switches for New Containers Switch Container Type RAIDset Stripeset Mirrorset N0Transportable Transportable Passthrough ENABLE_ACCESS_PATH DISABLE_ACCESS_PATH MAX_READ_CACHED_TRANSFER_SIZE MAX_WRITE_CACHED_TRANSFER_SIZE MAXIMUM_CACHED_TRANSFER_SIZE PARTITION partit...

Page 51: ...st connections specify DISABLE_ACCESS_PATH ALL when the unit is added then use the SET unit command to specify the set of host connections that are to have access to the unit Enabling the access path to a particular host connection does not override previously enabled access paths All access paths previously enabled are still valid the new host connection is simply added to the list of connections...

Page 52: ...e controller The controller will not cache any transfers over the size set Acceptable block sizes are 0 through 2048 The MAXIMUM_CACHED_TRANSFER_SIZE switch affects both read and write back cache when set on a controller that has read and write back caching The use of this switch has the effect of setting both the MAX_READ_CACHED_TRANSFER_SIZE and the MAX_WRITE_CACHED_TRANSFER_SIZE switches PARTIT...

Page 53: ...NTROLLER to instruct this controller to bring this unit online Select PREFERRED_PATH OTHER_CONTROLLER to instruct the other controller to bring this unit online NOTE All partitions on a container must be addressed through the same controller If you set PREFERRED_PATH for one partition all partitions on that container inherit the same preferred path setting READ_CACHE default NOREAD_CACHE Sets the ...

Page 54: ...ins down all the disks used in the unit The drives making up the unit spin down after the data has been completely flushed NOTE Do not specify the RUN NORUN switches for partitions WRITE_LOG NOWRITE_LOG default Marks the defined unit as an OpenVMS Host Based Volume Shadowing shadow set member IMPORTANT This switch is only supported with ACS version 8 7R or version 8 7W code NOTE The specified unit...

Page 55: ...enable Host Based Logging However Host Based Logging has not as yet been activated for the unit through a specific Host initiated command to do so Host Based Logging Specified Enabled Active Indicates that a prior SET unit number WRITE_LOG command has been entered for the specified unit and the controller in a single controller configuration or both controllers in a dual redundant controller pair ...

Page 56: ...e request from the host it places the data in its cache module writes the data to the disk drives then notifies the host when the write operation is complete This process is called write through caching because the data passes through and is stored in the cache memory on its way to the disk drives Write through caching is only enabled when write back caching is disabled or when the MAXIMUM_CACHED_...

Page 57: ...ented to each host connection as LUN 5 offset Offset is a host connection characteristic specified in the ADD or SET CONNECTIONS command If the controller pair is in multiple bus failover mode this unit can potentially be seen by all four controller ports but is accessible only by host connections Server1 and Server2 It is presented to each host connection as LUN 5 offset To create unit D7 from a ...

Page 58: ...mand only stops the CLI from displaying the error There are three message types General information Warning user may want to examine but the command is executed Error command will not execute Syntax CLEAR_ERRORS CLI Parameters There are no parameters associated with this command Switches There are no switches associated with this command Example To clear any message enter CLEAR_ERRORS CLI See Also...

Page 59: ...FAILOVER or SET NOMULTIBUS FAILOVER commands first Syntax CLEAR_ERRORS controller INVALID_CACHE data retention policy Parameters The following parameters are required for the CLEAR_ERRORS INVALID_CACHE command controller data retention policy These parameters are described in the following paragraphs controller Identifies which controller is to receive the CLEAR_ERRORS command You must specify THI...

Page 60: ...rd unwritten cache data in the following situations If the cache module has been replaced Any other reason not listed above CAUTION Specifying the DESTROY_UNFLUSHED_DATA parameter destroys data remaining in cache which can result in data loss Switches There are no switches associated with this command Examples To clear an invalid cache error on this controller after replacing a controller module e...

Page 61: ...ror condition has been corrected You must enter this command so the controller can recognize the device after the cause of the error has been corrected Syntax CLEAR_ERRORS device name UNKNOWN NOTE The keyword UNKNOWN cannot be abbreviated Parameters device name Identifies the device with the unknown error Switches There are no switches associated with this command Example To force the controller t...

Page 62: ...s or lost data block errors on a RAIDset causes a reconstruction of all parity blocks Clearing lost data errors or lost data block errors on a mirrorset causes members to normalize Syntax CLEAR_ERRORS unit number LOST_DATA NOTE The keyword LOST_DATA cannot be abbreviated CAUTION When prompted to issue this command data loss has occurred Parameters unit number Identifies the unit number on which th...

Page 63: ...0 Array Controller V8 7 Command Line Interface Reference Guide 2 47 CLEAR_ERRORS unit number LOST_DATA See Also CLEAR_ERRORS CLI CLEAR_ERRORS INVALID_CACHE CLEAR_ERRORS UNKNOWN CLEAR_ERRORS UNWRITEABLE_DATA ...

Page 64: ...ache and clears the unwriteable data error CAUTION This command will cause data loss Syntax CLEAR_ERRORS unit number UNWRITEABLE_DATA IMPORTANT Because misuse of this command will cause data loss the command cannot be abbreviated Parameters unit number Identifies the unit having the unwriteable data error The unit number is the name given to the unit when it was created with the ADD UNITS command ...

Page 65: ...ler V8 7 Command Line Interface Reference Guide 2 49 CLEAR_ERRORS unit number UNWRITEABLE_DATA See Also CLEAR_ERRORS CLI CLEAR_ERRORS INVALID_CACHE CLEAR_ERRORS LOST_DATA CLEAR_ERRORS UNKNOWN RETRY_ERRORS UNWRITEABLE_DATA ...

Page 66: ...ER or SET NOMULTIBUS FAILOVER CLI command only Enter this command to ensure all of the old configuration information is removed when a controller module is moved from one subsystem to another Dual redundant controller subsystems have the configuration information stored on the other controller and do not need to use the INITIALIZE container name SAVE_CONFIGURATION command unless the subsystem is b...

Page 67: ...entarily press the reset button 2 Continue holding the port button until the port button 5 LED starts FLASHING 3 Release the port button Syntax CONFIGURATION RESET Parameters There are no parameters associated with this command Switches There are no switches associated with this command Example To erase the subsystem configuration information in this controller enter CONFIGURATION RESET See Also C...

Page 68: ... port button until the port button 5 LED starts FLASHING 3 Release the port button If the controller you are installing was previously used in another subsystem it will restart with the configuration that resides in its nonvolatile memory If this differs from the current configuration of the subsystem you can purge the controller s old configuration with the following command CONFIGURATION RESET U...

Page 69: ...re are no parameters associated with this command Switches There are no switches associated with this command Example To restore the subsystem configuration into the memory of the controller in a single controller subsystem enter CONFIGURATION RESTORE See Also CONFIGURATION RESET CONFIGURATION SAVE INITIALIZE ...

Page 70: ...n immediate update In single controller subsystems the configuration is saved on the disk array If a container had the SAVE_CONFIGURATION switch specified when it was initialized through the INITIALIZE command the disks that constitute that unit is able to save a copy of the configuration IMPORTANT Use this command for a single controller configuration only StorageWorks does not recommend using th...

Page 71: ...ability IMPORTANT Due to heavy controller resource requirements for both Partitions and Host Based Logging capability the two aspects are deemed mutually exclusive This aviods exhausting the existing level of resources available to either The following restrictions apply to this command If no units are enabled for Host Based Logging the CREATE PARTITION command is allowed If one or more units are ...

Page 72: ...e of the space allocated to the partition Specify SIZE LARGEST to Have the controller create the largest partition possible from unused space on the disk or storageset Create the last partition on a container Because the remaining space is not equal to an exact percentage value specifying LARGEST allows you to optimize use of the remaining space Example To create a RAIDset named RAID9 divide it in...

Page 73: ...HSG80 Array Controller V8 7 Command Line Interface Reference Guide 2 57 CREATE_PARTITION See Also ADD UNITS DELETE unit number DESTROY_PARTITION SET unit number SHOW unit number ...

Page 74: ...nds use of this command is heavily restricted Refer to the StorageWorks by Compaq Data Replication Manager HSG80 ACS Version 8 7P Operations Guide for examples of usage Syntax DELETE association set name Parameters association set name The name of the association set to be deleted Switches There are no switches associated with this command Examples To delete association set AS4 enter DELETE AS4 Se...

Page 75: ...t the unit must be deleted before deleting the concatset Syntax DELETE concatset name Parameters concatset name The name of the concatset to be deleted Switches There are no switches associated with this command Examples To delete concatset C1 which is associated with unit D0 enter DELETE D0 DELETE C1 See Also DELETE unit number SET concatsets DELETE concatset name ...

Page 76: ...th is enabled explicitly through the ENABLE_ACCESS_PATH qualifier of the ADD UNITS or SET unit commands If access path is generically enabled for all connections ENABLE_ACCESS_PATH ALL then any or all connections can be deleted A connection with explicit access path must have the access path disabled through the DISABLE_ACCESS_PATH qualifier of the SET unit command before the connection can be del...

Page 77: ...ss the access path to Server1 is specifically enabled for one or more units enter DELETE SERVER1 To delete host connection Server4 from the table of known connections when Server4 has explicit access path to unit D7 enter SET D7 DISABLE_ACCESS_PATH SERVER4 DELETE SERVER4 See Also ADD CONNECTIONS ADD UNITS SET connection name SET unit number SHOW CONNECTIONS SHOW connection name ...

Page 78: ...ed from the copy set NOTE This command does not delete failedsets or sparesets See page 2 64 and page 2 66 for details When a storageset is deleted the individual disks are free to be used by another container If you create the container again with the exact same disk configuration and none of the disks have been used for anything or initialized then the container can be reassembled using its orig...

Page 79: ...Array Controller V8 7 Command Line Interface Reference Guide 2 63 DELETE container name To delete a RAIDset named RAID9 enter DELETE RAID9 See Also DELETE FAILEDSET DELETE SPARESETS SHOW STORAGESETS UNMIRROR ...

Page 80: ...fore physically removing failed members from the storage enclosure for testing repair or replacement You should consider all disk drives in the failedset as defective Repair or replace disks found in the failedset Syntax DELETE FAILEDSETS disk name Parameters disk name Identifies the disk you want to delete from the failedset Only one disk at a time can be removed from a failedset Switches There a...

Page 81: ...orks only on the site acting as initiator This is the local site except in a failover situation This DELETE command is only valid if the error mode of the remote copy set is normal The error mode is set by the ERROR_MODE switch of the SET remote copy set command If the remote copy set is a member of an association set the association set must be deleted before the remote copy set is deleted Syntax...

Page 82: ...t not yet added to the controller configuration Syntax DELETE SPARESETS disk name Parameters disk name Identifies the disk drive being deleted from the spareset Remove only one disk at a time from a spareset Switches There are no switches associated with this command Example To remove DISK20300 from the spareset enter DELETE SPARESETS DISK20300 See Also ADD SPARESETS SHOW SPARESETS DELETE SPARESET...

Page 83: ...errors occur when trying to flush the user data the logical unit is not deleted To delete a unit that has existing errors you must clear all the errors using a CLEAR_ERRORS command Syntax DELETE unit number Parameters unit number Identifies the unit number to be deleted The unit number is the same name given to the unit when it was created using the ADD UNITS command Switches There are no switches...

Page 84: ...2 68 HSG80 Array Controller V8 7 Command Line Interface Reference Guide CLI Command Descriptions DELETE FAILEDSETS DELETE SPARESETS DESTROY_PARTITION ...

Page 85: ...h they were created must be initialized Syntax DESTROY_PARTITION container name PARTITION partition number Parameters The following parameters are available to the DESTROY_PARTITION command container name partition number These parameters are described in the following paragraphs container name Identifies the disk or storageset containing the partition to be destroyed This is the name given to the...

Page 86: ...2 on RAIDset RAID9 and destroy the partition enter DELETE D102 DESTROY_PARTITION RAID9 PARTITION 2 If partition 2 of RAID9 has not yet been assigned a unit number to delete partition 2 enter DESTROY_PARTITION RAID9 PARTITION 2 See Also CREATE_PARTITION DELETE unit number INITIALIZE SHOW container name SHOW unit number SHOW storageset name ...

Page 87: ...witches associated with this command Example To display a directory listing enter DIRECTORY The following is an example of the resultant display HSUTIL V87P D FRUTIL V87P D CHVSN V87P D CLCP V87P D CLONE V87P D CLONEW V87P D CONFIG V87P D DILX V87P D DIRECT V87P D DSTAT V87P D DWNGRD V87P D FMU V87P D VTDPY V87P D NOTE CHVSN DSTAT and DWNGRAD are not user utilities These utilities are used by Stor...

Page 88: ... only to terminate a remote virtual terminal connection Use of this command exits the CLI program and returns control to the host Syntax EXIT Parameters There are no parameters associated with this command Switches There are no switches associated with this command Example To terminate the CLI program enter EXIT EXIT ...

Page 89: ...mple To display information regarding the HELP command enter HELP The following is displayed Help may be requested by typing a question mark at the CLI prompt This will print a list of all available commands For further information you may enter a partial command and enter a space followed by a to print a list of all available options at that point in the command For example SET THIS_CONTROLLER Pr...

Page 90: ...rrorsets If a partitioned container is initialized all partitions are eliminated Syntax INITIALIZE container name If you initialize a transportable disk any metadata contained on the disk is destroyed and the entire disk drive is accessible by the host The drive does not have the error detection and data security provided by the metadata that is on notransportable disks Use the INITIALIZE command ...

Page 91: ...ze Example HSG80 INITIALIZE DISKxxxxx CAPACITY 4000000 HSG80 SHOW DISKxxxxx NOTE The new capacity is not seen after this command To show the new size enter HSG80 ADD UNIT Dx HSG80 SHOW Dx CYLINDERS n 1 to16 777 215 HEADS n 1 to 255 SECTORS_PER_TRACK n 1 to 255 These commands are used to set the geometry switches reported to the host NOTE The geometry switches should not be used unless there is a c...

Page 92: ...tialized container is to be handled NOTE The DESTROY and NODESTROY switches are valid only with striped mirrorsets and mirrorsets Specify NODESTROY to preserve forced error metadata during the initialization process Use the NODESTROY switch only when a unit is to be created from disk drives reduced from mirrorsets This allows the data on the container to be accessed by a mirrorset or striped mirro...

Page 93: ...e controller configuration on it enter INITIALIZE DISK10000 SAVE_CONFIGURATION To initialize RAID4 and to reserve an area for configuration information on all the disks that constitute RAID4 enter INITIALIZE RAID4 SAVE_CONFIGURATION To initialize stripeset STRIPE1 with the default chunk size enter INITIALIZE STRIPE1 NOTE Note that the chunk size is not specified so the controller initializes the u...

Page 94: ...MHZ negotiated LOCAL Size 4108970 blocks Configuration being backed up on this container DISK30300 disk 3 3 0 S2 DEC RZ28M C DEC 1003 Switches NOTRANSPORTABLE TRANSFER_RATE_REQUESTED 20MHZ synchronous 10 00 MHZ negotiated LOCAL Size 4108970 blocks Configuration being backed up on this container See Also ADD DISKS ADD MIRRORSETS ADD RAIDSETS ADD STRIPESETS ADD PASSTHOUGH ADD UNITS CONFIGURATION RES...

Page 95: ...on a failed device The LED stays ON even after being turned OFF with the LOCATE CANCEL command NOTE The LOCATE command can also be used to test the device fault LED Not all devices provide a device fault LED therefore these devices cannot be identified using the LOCATE command Syntax LOCATE parameter Parameters The following parameters are available to the LOCATE command ALL CANCEL container name ...

Page 96: ... the given SCSI location to FLASH UNITS Causes the device fault LEDs of all devices used by the units to FLASH NOTE This parameter is useful for determining which storage devices are not currently configured into logical units unit number Causes the device fault LEDs on the devices making up the unit number to FLASH Switches There are no switches associated with this command Examples To cause the ...

Page 97: ...EPLACE disk name command to add more members to the mirrorset Syntax MIRROR disk name mirrorset name Parameters The following parameters are available to the MIRROR command disk name mirrorset name These parameters are described in the following paragraphs disk name Specifies the name of the disk to convert to a one member mirrorset The disk must be part of a unit mirrorset name Assigns a name for...

Page 98: ...iority over the copy operation If you specify COPY NORMAL creating the mirrored data has a minimal impact on performance POLICY BEST_FIT POLICY BEST_PERFORMANCE default NOPOLICY Sets the selection criteria the controller uses to choose a replacement disk from the spareset when a mirrorset member fails Specify POLICY BEST_FIT to choose a replacement disk drive from the spareset that equals or excee...

Page 99: ...he normal stripeset a mirrorset containing two members The commands used in the script below set the nominal number of members in each mirrorset to two and add a second disk to each mirrorset Because the higher level structure of the stripeset is carried down to the mirrorsets initialization of the mirrorsets or adding them as units is not necessary ADD STRIPESETS STRIPE1 DISK10100 DISK20100 DISK3...

Page 100: ..._OFF OVERRIDE_BAD_FLUSH and NO_OVERRIDE_BAD_FLUSH SECONDS These switches are described in the following paragraphs BATTERY _ON BATTERY_OFF default Instructs the external cache battery ECB charger to turn OFF or remain ON Specify BATTERY_ON to keep the ECB charger ON after the POWEROFF command is issued Specify BATTERY_OFF to turn OFF the ECB charger after the POWEROFF command is issued NOTE The EC...

Page 101: ...D_FLUSH switch unwritten data could be lost Do not power off the subsystem until the unwritten data has been recovered Table 2 2 POWEROFF Switch Settings Battery Switch Override Switch Flush Results Action BATTERY_ON OVERRIDE_BAD_FLUSH Success Controller and units in the enclosure shut down and the ECB charger remains ON BATTERY_ON OVERRIDE_BAD_FLUSH Failure Controller and units in the enclosure s...

Page 102: ...s and the enclosure in 10 seconds BATTERY_OFF and NO_OVERRIDE_BAD_FLUSH are the defaults enter POWEROFF SECONDS 10 BATTERY_OFF NO_OVERRIDE_BAD_FLUSH Success Controller and units in enclosure shut down and the ECB charger turned OFF BATTERY_OFF NO_OVERRIDE_BAD_FLUSH Failure Nothing is shut down the ECB charger remains ON and the user is notified of a bad flush Table 2 2 POWEROFF Switch Settings Con...

Page 103: ... in the mirrorset may be less than the nominal number of members if A disk drive is not added back to the mirrorset A member remains removed from the mirrorset The mirrorset replacement policy switch NOPOLICY is specified with the SET mirrorset name command No spare disks exist The actual number of members in the mirrorset can never be greater than the nominal number of members The disks to be rem...

Page 104: ...ame2 disk name3 Specifies the names of the disk or disks to be removed from the mirrorset or mirrorsets Multiple members can be removed with the REDUCE command Switches There are no switches associated with this command Example To remove DISK20100 DISK20200 and DISK40200 from their respective mirrorsets enter SHOW STRIPE1 Name Storageset Uses Used by STRIPE1 stripeset MIRR1 D104 MIRR2 MIRR3 SHOW M...

Page 105: ... Command Line Interface Reference Guide 2 89 REDUCE MIRR1 mirrorset DISK10100 STRIPE1 MIRR2 mirrorset DISK10200 STRIPE1 MIRR3 mirrorset DISK30300 STRIPE1 See Also ADD MIRRORSETS MIRROR RUN CLONE SET mirrorset name SHOW MIRRORSETS ...

Page 106: ...scribed in the following paragraphs old container name Specifies the existing name of the container or host connection new container name Assigns the new name for the container or host connection A name of a host connection can be any combination of letters and numbers with the one restriction that it cannot take the form of the default assigned by the controller NEWCONnn Switches There are no swi...

Page 107: ...HUTDOWN These switches are described in the following paragraphs IGNORE_ERRORS NOIGNORE_ERRORS default Controls the reaction of the controller based on the status of write back cache CAUTION The IGNORE_ERRORS switch might cause the controller to keep unflushed data in the write back cache until it restarts and is able to write the data to devices Do not perform any hardware changes until the contr...

Page 108: ...cache Do not perform any hardware changes until the controller flushes the cache Specify IMMEDIATE_SHUTDOWN to instruct the controller to restart immediately without flushing data from the write back cache to devices Specify NOIMMEDIATE_SHUTDOWN to instruct the controller not to restart before all data has been flushed from write back cache to the devices Examples To restart this controller enter ...

Page 109: ...an unwriteable data error is reported Syntax RETRY_ERRORS unit number UNWRITEABLE_DATA Parameter unit number Identifies the unit number to which the data contained in write back cache tries to write The unit number is the same name given to the unit when it was created using the ADD UNITS command Switches There are no switches associated with this command Example To retry the writing of the cached...

Page 110: ... host unit data CLONEW A utility used in the same manner as the CLONE utility except that it uses the linked WWID associated with the source unit instead of allocating a new one CONFIG A utility used to locate and add devices to the controller configuration The CONFIG utility may be run anytime new devices are added to the subsystem DILX A utility used to test and verify the controller operation w...

Page 111: ...y may be used by StorageWorks authorized service providers only FMU A fault management utility used to control several spontaneous errors FMU also displays information regarding the most recent controller and memory system failure FRUTIL A utility used when replacing a failed controller external cache battery or cache module HSUTIL A utility used to format a disk device or to download new firmware...

Page 112: ...2 96 HSG80 Array Controller V8 7 Command Line Interface Reference Guide CLI Command Descriptions See Also DIRECTORY ...

Page 113: ... available to the SELFTEST controller command IGNORE_ERRORS and NOIGNORE_ERRORS IMMEDIATE_SHUTDOWN and NOIMMEDIATE_SHUTDOWN These switches are described in the following paragraphs IGNORE_ERRORS NOIGNORE_ERRORS default Instruct the controller how to respond to write back cache errors CAUTION The IGNORE_ERRORS switch might cause data to remain in write back cache Do not perform any hardware changes...

Page 114: ... flushes the cache Select IMMEDIATE_SHUTDOWN to instruct the controller to run the self test program immediately without flushing user data from write back cache to devices Select NOIMMEDIATE_SHUTDOWN to instruct the controller to flush data from write back cache before running the self test program Examples To start the self test program on this controller enter SELFTEST THIS_CONTROLLER To run th...

Page 115: ...d with any SET association set name command Parameters association set name These name of the association set whose characteristics are to be changed Switches The following switches are available for the SET association set name command ADD FAIL_ALL and NOFAIL_ALL LOG_UNIT and NOLOG_UNIT ORDER_ALL and NOORDER_ALL These switches are described in the following paragraphs ADD remote copy set name Thi...

Page 116: ... Should the initiator become unable to access the target the unit specified by unit name logs a history of write commands from the host When the target becomes accessible the initiator can read the log disk and can send the write commands in order to the target which brings the target into congruency with the initiator CAUTION When the command is entered a header is immediately written to the log ...

Page 117: ...RDER_ALL is specified Members of the association set start to log or not independently The order of all asynchronous write operations across all members of the association set is not preserved This switch cannot be changed when a log unit is assigned to the association set The log unit must be removed then the order switch changed then the log unit must be reassigned The order switch goes into eff...

Page 118: ... data inaccessible This command is subject to restrictions Both storagesets must be of the same type If either member storageset becomes inoperative the concatset becomes inoperative However a reduced RAIDset does not make the concatset inoperative Mirrorsets cannot be used Partitions cannot be used Concatsets cannot be partitioned The maximum total disks in a concatset is 24 Storagesets must have...

Page 119: ...ncatenates the storageset specified by storage set name to the concatset Examples To expand the capacity of unit D0 which consists of stripeset Stripe1 by adding another stripeset Stripe2 enter ADD CONCATSETS C1 STRIPE1 SET C1 ADD STRIPE2 See Also ADD CONCATSETS DELETE concatsets SHOW CONCATSETS ...

Page 120: ...SET connection name command changes the operating parameters of the specified host connection A host connection is a specific instance of one host connected to one port of one controller through one host adapter Syntax SET connection name Parameters connection name This is the name of the host connection When a new host adapter port controller connection is made the new connection is given a defau...

Page 121: ...vailable path When set to CONNNECTION_BASED the persistent reservation is only valid for the port on which it is received thereby limiting the host access to those paths that have been explicitly reserved IMPORTANT If a particular host prefers either the CONNECTION_BASED or HBA_PORT_ID_BASED reservation style all the connections to that particular host must have identical reservation style setting...

Page 122: ...he logical unit number presented to the host connection Unit number the number assigned to the unit in the ADD UNITS command This is the number by which the unit is known internally to the controllers Example set newcon31 operating_system vms unit_offset 20 See Also ADD CONNECTIONS SHOW CONNECTIONS DELETE connections RENAME ...

Page 123: ...NTROLLER command to verify that the changes went into effect Syntax SET controller Parameter controller Identifies which controller is to be set Specify THIS_CONTROLLER the one connected to the CLI maintenance terminal or OTHER_CONTROLLER Switches Table 2 3 lists the switches available with this command Descriptions of the switches follow the table SET controller Table 2 3 SET controller Switches ...

Page 124: ...FABRIC PORT_2_TOPOLOGY FABRIC None PORT_1_TOPOLOGY LOOP_HARD PORT_1_TOPOLOGY LOOP_SOFT PORT_1_TOPOLOGY OFFLINE PORT_2_TOPOLOGY LOOP_HARD PORT_2_TOPOLOGY LOOP_SOFT PORT_2_TOPOLOGY OFFLINE None PROMPT new prompt 1 16 characters REMOTE_COPY node name NOREMOTE_COPY None SCSI_VERSION SCSI 2 SCSI_VERSION SCSI 3 None SMART_ERROR_EJECT Disable Enable TERMINAL_PARITY NOTERMINAL_PARITY Odd or even no termin...

Page 125: ...alue entered for this switch takes effect immediately COMMAND_CONSOLE_LUN NOCOMMAND_CONSOLE_LUN Enables or disables the command console LUN CCL a communication LUN used to initially setup StorageWorks Command Console When changed the new setting for this switch takes effect immediately This switch works in SCSI 2 mode only This switch has no effect in SCSI 3 mode SCSI mode is set by the SCSI_MODE ...

Page 126: ...erformed when the NOMIRRORED_CACHE switch is specified Data in write back cache is flushed when cache is configured in nonmirrored mode Enables mirrored write back cache on both controllers If an invalid cache configuration exists within the cache modules an error is generated IMPORTANT Both controllers must be operational before this command is accepted Issue this switch through only one controll...

Page 127: ...air in the enclosure assumes The port IDs derive from the node ID The node ID assigned to a enclosure never changes The node ID ends in a zero An example of a node ID is 5000 1FE1 FF0C EE00 The derivation of port IDs from the node ID is done automatically by the controllers The numerical value of the port IDs depends on what failover mode the controllers are in In transparent failover mode the por...

Page 128: ...Ds If a situation occurs that requires the node ID to be reset it can be done through the CLI by specifying the NODE_ID parameter in the SET controller command The node ID must be reset to the number on the enclosure sticker The sticker calls it the worldwide name The sticker also contains a checksum which verifies the ID number When the node ID is entered both controllers assume the correct port ...

Page 129: ...ontroller selects the AL PA for a host port or whether the port is to be set offline used only in AL PA FC AL PA topology LOOP_HARD allows you to pick the AL PA LOOP_SOFT requests the controller to pick the ALPA OFFLINE sets the host port offline Specify OFFLINE for a port when it is not used IMPORTANT If a topology is already selected topology must be set to offline before another topology is sel...

Page 130: ...tocol to use SCSI 3 means that the controller uses some SCSI 3 commands It does not mean that it is a fully compliant SCSI 3 device The command console LUN CCL presents to the host a LUN through which it communicates with the controller A side effect of the SCSI mode is how the command console LUN CCL is handled SCSI 2 specifies that the CCL is not fixed at a particular location but floats dependi...

Page 131: ...hecks Setting the UPS NOUPS switch for either controller sets the switch for both controllers Both controllers must be restarted in order for the new setting to take effect Specify UPS NODE_ONLY if your storage subsystem power is supplied by a separate uninterruptible power supply UPS directly connected to a PVA module If NODE_ONLY is specified the controller continues to check the condition of th...

Page 132: ... copy mode enter SET THIS_CONTROLLER REMOTE_COPY LONDON NOTE The other controller in the pair automatically receives the same name SMART Error Drive Eject Disabled example AP_TOP show this Controller HSG80 ZG02804912 Software V87S 0 Hardware E12 NODE_ID 5000 1FE1 FF00 0090 ALLOCATION_CLASS 1 SCSI_VERSION SCSI 3 Configured for MULTIBUS_FAILOVER with ZG02804288 In dual redundant configuration Device...

Page 133: ...NODE_ID 5000 1FE1 FF00 0090 ALLOCATION_CLASS 1 SCSI_VERSION SCSI 3 Configured for MULTIBUS_FAILOVER with ZG02804288 In dual redundant configuration Device Port SCSI address 7 Time 22 NOV 2001 01 17 47 Command Console LUN is lun 0 IDENTIFIER 99 Host Connection Table is NOT locked Smart Error Eject Enabled See Also RESTART controller SET FAILOVER SET MULTIBUS_FAILOVER SHOW controller SHUTDOWN contro...

Page 134: ...TRANSFER_RATE_REQUESTED DEFAULT TRANSFER_RATE_REQUESTED 20MHZ default TRANSFER_RATE_REQUESTED 10MHZ TRANSFER_RATE_REQUESTED 5MHZ Specifies the maximum data transfer rate for the controller to use in communicating with the device You may need to limit the transfer rate to accommodate long cables between the controllers and the device NOTE This switch is used by all container types TRANSPORTABLE NOT...

Page 135: ...it must be initialized If you specify TRANSPORTABLE for a disk that was originally initialized as a NOTRANSPORTABLE you should initialize the disk StorageWorks recommends you avoid specifying TRANSPORTABLE unless transportability of the device or media is imperative and there is no other way to accomplish moving the data NOTE Specifying TRANSPORTABLE should be avoided unless transportability of th...

Page 136: ...t the same settings as the master EMU Syntax SET EMU Parameters There are no parameters for this command Switches The following switches are available to the SET EMU command ALARM FANSPEED SENSOR n SETPOINT These switches are described in the following paragraphs ALARM silent ALARM audible Determines whether or not the audible alarm of the EMU will sound in the following cases Drive failure Contro...

Page 137: ... for the primary subsystem enclosure Sensor 3 sets the maximum operating temperature for the EMU unit The allowable range for the setpoint is 0 C 32 F to 49 C 120 F The EMU determines the default setpoint for all three sensors Table 2 4 lists the valid EMU set point temperatures in both Fahrenheit and Celsius If any of the setpoints assigned to a slave EMU do not match the corresponding setpoints ...

Page 138: ...ons Refer to the enclosure documentation for detailed information about setting the EMU temperature set points Examples This example shows how to set EMU sensor number 2 to 34 C SET EMU SENSOR_2_SETPOINT 34 This example shows how to set the EMU fan to operate at high speed SET EMU FANSPEED HIGH ...

Page 139: ...e Port Commands from all other sources are rejected with a SCSI status of ASC 91 ASCQ 08 Syntax SET DISABLE_MANAGERS ALL SET DISABLE_MANAGERS connection names Parameters There are no parameters associated with this command Switches There are no switches associated with this command Examples To revoke the ability of host1 and host2 to issue CLI commands enter SET DISABLE_MANAGERS host1 host2 To rev...

Page 140: ...2 124 HSG80 Array Controller V8 7 Command Line Interface Reference Guide CLI Command Descriptions See Also SET ENABLE_MANAGERS SHOW MANAGERS ...

Page 141: ... CLI commands issued through the Maintenance Port of the HSG80 NOTE This command has no effect on I O operations It only affects the host s ability to issue CLI commands to the HSG80 Syntax SET ENABLE_MANAGERS ALL SET ENABLE_MANAGERS connection names Parameters There are no parameters associated with this command Switches There are no switches associated with this command Examples To accept only c...

Page 142: ...functional and contains no metadata that is a new device one that has not been initialized If you specify the AUTOSPARE switch when a disk is physically replaced in the failedset the controller checks to see if any metadata is present If the controller detects metadata the disk remains in the failedset If the controller does not detect metadata the controller automatically initializes the disk and...

Page 143: ...SPORTABLE 3 Initialize the disk INITIALIZE DISK10000 4 Delete the disk DELETE DISK10000 5 Add disk to the Spareset or remove disk from the enclosure Example To enable the automatic spare feature enter SET FAILEDSET AUTOSPARE To disable the automatic spare feature enter SET FAILEDSET NOAUTOSPARE See Also DELETE FAILEDSET SHOW FAILEDSET ...

Page 144: ...eters for this command Switches COPY controller Identifies which controller contains the source subsystem configuration for the copy You must specify THIS_CONTROLLER the one connected to the CLI maintenance terminal or OTHER_CONTROLLER The companion controller receiving the configuration information restarts after the command is executed CAUTION Make sure you know which controller has the good con...

Page 145: ...T FAILOVER COPY controller Example To set the controllers in transparent failover mode and copy the configuration information from this controller to other controller enter SET FAILOVER COPY THIS_CONTROLLER See Also SET MULTIBUS_FAILOVER SET NOFAILOVER SET NOMULTIBUS_FAILOVER ...

Page 146: ...he SET mirrorset name command COPY MEMBERSHIP POLICY and NOPOLICY READ_SOURCE REMOVE REPLACE These switches are described in the following paragraphs COPY FAST COPY NORMAL default Sets the speed at which the controller copies data to a new member from normal mirrorset members when data is being mirrored to the storageset s disk drives Specify COPY FAST to allow the creation of mirrored data to tak...

Page 147: ...ers Specify the REMOVE switch to reduce the number of disk drives from the mirrorset POLICY BEST_FIT POLICY BEST_PERFORMANCE default NOPOLICY Sets the selection criteria the controller uses to choose a replacement disk from the spareset when a mirrorset member fails Specify POLICY BEST_FIT to choose a replacement disk drive from the spareset that equals or exceeds the base member size smallest dis...

Page 148: ...ecified by disk name is removed from the mirrorset specified by mirrorset name The removed disk drive is added to the failedset NOTE No other switches can be set when the REMOVE switch is specified For each reduced mirrorset there must be at least one remaining normal member after the reduction A normal member is one whose contents are the same as the other members Unlike the REDUCE command the RE...

Page 149: ...dded to the configuration with the ADD DISKS command NOTE Do not specify any other switches when the REPLACE switch is specified Examples To change the replacement policy of mirrorset MIRR1 to BEST_FIT enter SET MIRR1 POLICY BEST_FIT To remove member DISK30000 from mirrorset MIRR1 created above enter SET MIRR1 REMOVE DISK30000 NOTE If the mirrorset has a replacement policy and an acceptable disk d...

Page 150: ...s COPY controller Identifies which controller contains the source configuration You must specify THIS_CONTROLLER the one connected to the CLI maintenance terminal or OTHER_CONTROLLER The companion controller receives the configuration information and restarts CAUTION Make sure you know which controller has the good configuration information before entering this command The device configuration inf...

Page 151: ... COPY THIS_CONTROLLER The configuration on this controller is automatically copied to the other controller when you issue the SET MULTIBUS_FAILOVER command If you want to prefer specific units to specific controllers use the following command after setting multiple bus failover SET D100 PREFERRED_PATH THIS_CONTROLLER SET D101 PREFERRED_PATH OTHER_CONTROLLER See Also SET FAILOVER SET NOFAILOVER SET...

Page 152: ...ontroller configurations It is recommended that both controllers be present when this command is carried out Otherwise the controllers become misconfigured with each other requiring additional steps later to allow the other controller to be configured for failover The SET NOFAILOVER and SET NOMULTIBUS_FAILOVER commands affect both controllers regardless of the controller on which the command is ca...

Page 153: ...che When the failed controller is replaced and placed into service the write back cache data is flushed to the appropriate devices Specify DESTROY_UNFLUSHABLE_DATA to reconfigure the operational controller before replacing the failed controller The unwritten data of the failed controller may reference devices not present in the new configuration If you do not destroy the old configuration data it ...

Page 154: ...LICY RECONSTRUCT REMOVE REPLACE These switches are described in the following paragraphs POLICY BEST_FIT POLICY BEST_PERFORMANCE default NOPOLICY Specifies the replacement policy to use when a member within the RAIDset fails Specify BEST_FIT to choose a replacement disk drive from the spareset that equals or exceeds the base member size smallest disk drive at the time the RAIDset was initialized I...

Page 155: ...ations The controller uses more resources to perform the reconstruction Reconstruction takes less time but overall controller performance is reduced during the reconstruction REMOVE disk name Instructs the controller to remove a member from an existing RAIDset The disk drive specified by disk name is removed from the RAIDset specified by RAIDset name The removed disk drive is added to the failedse...

Page 156: ...a configuration including a spareset NOTE Do not specify other switches when you use the REPLACE switch Examples To change the replacement policy for RAIDset RAID9 to BEST_FIT enter SET RAID9 POLICY BEST_FIT To remove member DISK10000 from the RAID9 RAIDset enter SET RAID9 REMOVE DISK10000 NOTE If there is a replacement policy the controller moves a disk from the spareset to the RAIDset automatica...

Page 157: ...f usage This command works only on the site that is functioning as initiator Syntax SET remote copy set name Parameters remote copy set name Specifies the name of the remote copy set to modify This is the name used with the ADD REMOTE_COPY_SETS command to identify the remote copy set as a host addressable unit Switches The following switches are available to the SET remote copy set name command AD...

Page 158: ...he site failover procedure Use of this switch is restricted to only site failover conditions Refer to the StorageWorks by Compaq Data Replication Manager HSG80 ACS Version 8 7P Operations Guide for examples of usage OPERATION_MODE SYNCHRONOUS default OPERATION_MODE ASYNCHRONOUS This switch determines which of two normal operating modes is assigned to the remote copy set In synchronous mode write o...

Page 159: ...ery procedure called mini merge When the target becomes accessible this switch enables the initiator to read the log disk and send the write commands in order to the target which brings the target into congruency with the initiator A SET remote copy set name command with the SUSPEND switch specified must have been entered prior to entering a SET remote copy set name command with the RESUME switch ...

Page 160: ...2 144 HSG80 Array Controller V8 7 Command Line Interface Reference Guide CLI Command Descriptions See Also ADD REMOTE_COPY_SETS SET controller REMOTE_COPY SHOW REMOTE_COPY_SETS SHOW remote copy set name ...

Page 161: ...TS command Switches Table 2 5 lists all switches for the SET unit number command and shows which switches can be used with each type of device and storageset Descriptions of the switches follow the table SET unit number Table 2 5 SET unit number Switches for Existing Containers Switch Container Type RAIDset Stripeset Mirrorset N0Transportable Disk Transportable Disk ENABLE_ACCESS_PATH DISABLE_ACCE...

Page 162: ... use this switch to restrict hosts from accessing certain units This switch limits visibility of specific units from certain hosts For example if two hosts are on the same bus you can restrict each host to access only specific units PREFERRED_PATH NOPREFERRED_PATH READ_CACHE NOREAD_CACHE READAHEAD_CACHE NOREADAHEAD_CACHE RUN NORUN WRITE_LOG NOWRITE_LOG WRITE_PROTECT NOWRITE_PROTECT WRITEBACK_CACHE...

Page 163: ...ault The IDENTIFIER switch creates a unique unit identifier that makes the unit visible to the host This number can be a value between 0 32767 Identifier is required for OpenVMS operating systems to identify the unit MAX_READ_CACHED_TRANSFER_SIZE n MAX_READ_CACHED_TRANSFER_SIZE 32 default Sets the largest number of read blocks to be cached by the controller The controller will not cache any transf...

Page 164: ...led controller is restarted the drives automatically return to the controller specified by the PREFERRED_PATH switch You can specify the PREFERRED_PATH switch for a single controller configuration however the switch will not take effect until you add a second controller and configure the two controllers for dual redundancy When no preferred path is assigned the unit is targeted through the control...

Page 165: ...ests across multiple units Read ahead caching improves host application performance since the data is read from the controller cache instead of disk Read ahead caching is the default for units If you have a unit that is not expected to get sequential I O requests select NOREADAHEAD_CACHE for the unit RUN default NORUN Controls the unit s availability to the host Specify RUN to make a unit availabl...

Page 166: ... for a previously enabled unit through the SET unit number NOWRITE_LOG command Host Based Logging Specified NOT Enabled Indicates that a prior SET unit number WRITE_LOG command has been entered for the specified unit but the controller in a single controller configuration or both controllers in a dual redundant controller pair configuration have not yet been restarted for Host Based Logging to bec...

Page 167: ...ew RAIDsets mirrorsets and units to take advantage of the controller write back caching feature This switch allows the controller to declare the write operation complete as soon as the data reaches its cache memory The controller performs the slower operation of writing the data to the disk drives at a later time CAUTION Though there is built in redundancy in mirrored cache to protect data allowin...

Page 168: ...s Examples To enable write protect and turn off the read cache on unit D102 enter SET D102 WRITE_PROTECT NOREAD_CACHE To allow only a host connection named Roger1 to access unit D0 enter SET D0 DISABLE_ACCESS_PATH ALL SET D0 ENABLE_ACCESS_PATH ROGER1 See Also ADD UNITS SHOW UNITS SHOW unit number ...

Page 169: ...yntax SHOW ASSOCIATIONS Parameters There are no parameters associated with this command Switches The following switch is available for the SHOW ASSOCIATIONS command FULL Example INT_TOP show association Name Association Uses Used by A1 association RCS1 RCS2 RCS3 RCS4 See Also ADD ASSOCIATION SET association set name SHOW association set name SHOW ASSOCIATIONS ...

Page 170: ...Parameters association set name Specifies the name of the association set to be displayed Switches There are no switches associated with this command Example INT_TOP show A1 Name Association Uses Used by A1 association RCS1 RCS2 RCS3 Switches NOFAIL_ALL NOORDER_ALL LOG_UNIT D12 No data logged See Also ADD ASSOCIATION SET association set name SHOW ASSOCIATIONS SHOW association set name ...

Page 171: ...subsystem Syntax SHOW CONCATSETS Parameters There are no parameters associated with this command Switches The following switch is available for the SHOW CONCATSETS command FULL Example show concatsets Name Storageset Uses Used by C1 concatset DISK10300 D1 DISK30400 See Also ADD CONCATSET SET concatset name SHOW concatset name SHOW CONCATSETS ...

Page 172: ...rs concatset name Specifies the name of the concatset to be displayed Switches There are no switches associated with this command Example BOT show C1 Name Storageset Uses Used by C1 concatset DISK10300 D1 DISK30400 State NORMAL DISK10300 member 0 is NORMAL DISK30400 member 1 is NORMAL Size 35538354 blocks See Also ADD CONCATSET SET concatset name SHOW CONCATSET SHOW concatset name ...

Page 173: ...apter ID address online or offline status and unit offset LOCKED appears in the title area when the connection table is locked If unlocked or not supported HOST_FC only Syntax SHOW CONNECTIONS Parameters There are no parameters associated with this command Switches The following switch is available for the SHOW CONNECTIONS command FULL This switch displays the rejected hosts with an index SHOW CON...

Page 174: ...Top sho conn full Connection LOCKED Name Operating System Controller Port Address Status Offset REV50A TRU64_UNIX THIS 1 011000 OL this 0 HOST_ID 2000 0000 C922 556D ADAPTER_ID 1000 0000 C922 556D REV50B TRU64_UNIX OTHER 1 031000 OL other 0 HOST_ID 2000 0000 C921 0919 ADAPTER_ID 1000 0000 C921 0919 Rejected connections Key HOST_ID ADAPTER_ID Controller THIS Port 1 2000 0000 C921 83FC 1000 0000 C92...

Page 175: ...eters connection name Specifies the name of the connection to be displayed Switches There are no switches associated with this command Examples The full switch displays rejected hosts with an index See Also ADD CONNECTIONS DELETE connection name SET CONNECTIONS SHOW connection name RENAME SHOW connection name SMV_Top sho REV50A Connection Name Operating System Controller Port Address Status Offset...

Page 176: ... full information for a controller enter SHOW OTHER_CONTROLLER FULL Controller HSG80 c Compaq xxxxxxxxxx Software xxxxxx Hardware xxxx NODE_ID 5000 1FE1 0005 9C10 ALLOCATION_CLASS 1 SCSI_VERSION SCSI 2 Configured for MULTIBUS_FAILOVER with ZG95005203 In dual redundant configuration Device Port SCSI address 7 Time NOT SET Command Console LUN is lun 0 NOIDENTIFIER Host Connection Table is NOT locked...

Page 177: ...irrored Cache 32 megabyte write cache version 0012 Cache is GOOD Unflushed data in cache Battery NOUPS FULLY CHARGED Expires 04 DEC 2002 Extended information Terminal speed 19200 baud eight bit no parity 1 stop bit Operation control 00000000 Security state code 25059 Configuration backup disabled Vendor ID DEC See Also RESTART controller SET controller SET FAILOVER SET MULTIBUS_FAILOVER SHUTDOWN c...

Page 178: ...re are no parameters associated with this command Switches The following switch is available for the SHOW DEVICES command FULL Example BOT show devices Name Type Port Targ Lun Used by DISK10000 disk 1 0 0 M1 DISK20000 disk 2 0 0 M1 DISK20400 disk 2 4 0 M1 DISK30400 disk 3 4 0 SPARESET See Also SHOW UNITS SHOW MIRRORSETS SHOW RAIDSETS SHOW STRIPESETS SHOW SPARESETS SHOW FAILEDSETS SHOW DEVICES ...

Page 179: ...rs There are no parameters associated with this command Switches The following switch is available for the SHOW DISK command FULL Example BOT show disks Name Type Port Targ Lun Used by DISK10000 disk 1 0 0 M1 DISK20000 disk 2 0 0 M1 DISK20400 disk 2 4 0 M1 DISK30400 disk 3 4 0 SPARESET See Also ADD DISKS DELETE container name SET device name SHOW device name SHOW DISKS ...

Page 180: ... name of the association set to be displayed Switches There are no switches associated with this command Example BOT show DISK10000 Name Type Port Targ Lun Used by DISK10000 disk 1 0 0 M1 COMPAQ BD0366349C 3B02 Switches NOTRANSPORTABLE TRANSFER_RATE_REQUESTED 20MHZ synchronous 20 00 MHZ negotiated Size 71114623 blocks See Also ADD DISKS DELETE container name SET device name SHOW DISKS SHOW disk na...

Page 181: ... Guide 2 165 SHOW EMU Displays information regarding the status of the environmental monitoring unit Syntax SHOW EMU Parameters There are no parameters associated with this command Switches The following switch is available for the SHOW EMU command FULL SHOW EMU ...

Page 182: ...failedset Syntax SHOW FAILEDSETS Parameters There are no parameters associated with this command Switches There are no switches associated with this command Example BOT show failedset Name Storageset Uses Used by FAILEDSET failedset DISK10000 Switches NOAUTOSPARE See Also DELETE FAILEDSET SET FAILEDSET SHOW SPARESETS SHOW FAILEDSETS ...

Page 183: ...ated with an ID the informational message No Units with Identifiers is displayed Syntax SHOW ID Parameters There are no parameters associated with this command Switches There are no switches associated with this command Examples To display a list of units associated with IDs enter SHOW ID See Also SET unit number SHOW ID Unit ID D0 D3 D7 D25 D123 12 9 24 90 1 ...

Page 184: ...rs There are no parameters associated with this command Switches There are no switches associated with this command Examples SHOW MANAGERS G80 SHOW MANAGERS Connection All Connections Enabled Name Operating System Controller Port Address Status NEWCON14 AIX THIS 1 011000 0 HOST_ID 2000 0000 C922 46E2 ADAPTER_ID 1000 0000 C922 46E2 NEWCON15 WINNT THIS 1 011200 0 HOST_ID 2000 0000 C927 6735 ADAPTER_...

Page 185: ...HSG80 Array Controller V8 7 Command Line Interface Reference Guide 2 169 SHOW MANAGERS See Also SET ENABLE_MANAGERS SET DISABLE_MANAGERS ...

Page 186: ...arameters There are no parameters associated with this command Switches The following switch is available for the SHOW MIRRORSETS command FULL Example BOT show mirrorset Name Storageset Uses Used by M1 mirrorset DISK10000 S1 DISK20000 DISK20400 M2 mirrorset DISK10100 S1 DISK20100 DISK30100 See Also ADD MIRRORSETS DELETE container name SHOW mirrorset name SHOW STRIPESETS SHOW MIRRORSETS ...

Page 187: ...ide 2 171 SHOW mirrorset name Displays information about the specified mirrorset Syntax SHOW mirrorset name Parameters mirrorset name Specifies the name of the mirrorset to be displayed Switches There are no switches associated with this command SHOW mirrorset name ...

Page 188: ...00 S1 DISK20000 DISK20400 Switches POLICY for replacement BEST_PERFORMANCE COPY priority NORMAL READ_SOURCE LEAST_BUSY MEMBERSHIP 3 3 members present State RECONSTRUCTING DISK20000 member 0 is NORMAL DISK20400 member 1 is NORMAL DISK10000 member 2 is COPYING 6 complete Size 71114623 blocks See Also ADD MIRRORSETS DELETE container name SHOW MIRRORSETS SHOW STRIPESETS ...

Page 189: ...s information about all passthrough devices known to the subsystem Syntax SHOW PASSTHROUGH Parameters There are no parameters associated with this command Switches The following switch is available for the SHOW PASSTHROUGH command FULL See Also ADD PASSTHROUGH DELETE container name SHOW PASSTHROUGH ...

Page 190: ... following switch is available for the SHOW RAIDSETS command FULL Example BOT show raidset full Name Storageset Uses Used by R0 raidset DISK10400 D0 DISK20500 DISK30000 Switches NOPOLICY for replacement RECONSTRUCT priority NORMAL CHUNKSIZE 256 blocks State RECONSTRUCT 3 complete DISK10400 member 0 is RECONSTRUCTING 3 complete DISK20500 member 1 is RECONSTRUCTING 3 complete DISK30000 member 2 is R...

Page 191: ...HSG80 Array Controller V8 7 Command Line Interface Reference Guide 2 175 SHOW RAIDSETS See Also ADD RAIDSETS DELETE container name SET RAIDset name SHOW RAIDset name ...

Page 192: ...Switches There are no switches associated with this command Example BOT show R0 Name Storageset Uses Used by R0 raidset DISK10400 D0 DISK20500 DISK30000 Switches NOPOLICY for replacement RECONSTRUCT priority NORMAL CHUNKSIZE 256 blocks State RECONSTRUCT 3 complete DISK10400 member 0 is RECONSTRUCTING 3 complete DISK20500 member 1 is RECONSTRUCTING 3 complete DISK30000 member 2 is RECONSTRUCTING 3 ...

Page 193: ...HSG80 Array Controller V8 7 Command Line Interface Reference Guide 2 177 SHOW raidset name See Also ADD RAIDSETS DELETE container name SET RAIDset name SHOW RAIDSETS ...

Page 194: ...ated with this command Switches The following switch is available for the SHOW REMOTE_COPY_SETS command FULL Example INT_TOP show remote_copy_sets Name Uses Used by RCS1 remote copy D1 A1 RCS2 remote copy D2 A1 RCS3 remote copy D3 A1 RCS4 remote copy D4 A1 See Also ADD ASSOCIATIONS ADD REMOTE_COPY_SETS DELETE remote copy set name SET remote copy set name SHOW ASSOCIATIONS SHOW controller SHOW remo...

Page 195: ...e of the remote copy set to be displayed Switches There are no switches associated with this command Example INT_TOP show RCS1 Name Uses Used by RCS1 remote copy D1 A1 Reported LUN ID 6000 1FE1 FF00 0090 0001 0010 3889 05C0 Switches OPERATION_MODE SYNCHRONOUS ERROR_MODE NORMAL FAILOVER_MODE MANUAL OUTSTANDING_IOS 200 Initiator INT D1 state ONLINE to this controller Not reserved Target state TGT D1...

Page 196: ...er V8 7 Command Line Interface Reference Guide CLI Command Descriptions See Also ADD ASSOCIATIONS ADD REMOTE_COPY_SETS DELETE remote copy set name SET remote copy set name SHOW ASSOCIATIONS SHOW controller SHOW REMOTE_COPY_SETS ...

Page 197: ...vices in the spareset Syntax SHOW SPARESETS Parameters There are no parameters associated with this command Switches There are no switches associated with this command Example BOT show spareset Name Storageset Uses Used by SPARESET spareset DISK30400 See Also ADD SPARESETS DELETE SPARESETS SHOW FAILEDSET SHOW SPARESETS ...

Page 198: ... controller FAILEDSETS Shows the failedset configured to the controller MIRRORSETS Shows all mirrorsets configured to the controller RAIDSETS Shows all RAIDsets configured to the controller SPARESETS Shows the sparesets configured to the controller STORAGESETS Shows all storagesets configured with the controller STRIPESETS Shows all stripesets configured to the controller Syntax SHOW STORAGESETS P...

Page 199: ...agesets Name Storageset Uses Used by S1 stripeset M1 D4 M2 M1 mirrorset DISK10000 S1 DISK20000 DISK20400 M2 mirrorset DISK10100 S1 DISK20100 DISK30100 SPARESET spareset FAILEDSET failedset See Also ADD DISKS ADD MIRRORSETS ADD RAIDSETS DELETE container name SHOW DISKS SHOW MIRRORSETS SHOW RAIDSETS SHOW UNITS ...

Page 200: ...n to the subsystem Syntax SHOW STRIPESETS Parameters There are no parameters associated with this command Switches The following switch is available for the SHOW STRIPESETS command FULL Example BOT show stripesets Name Storageset Uses Used by S1 stripeset M1 D4 M2 See Also ADD STRIPESETS DELETE container name SHOW stripeset name SHOW STRIPESETS ...

Page 201: ...ripeset name Specifies the name of the stripeset to be displayed Switches There are no switches associated with this command Example BOT show S1 Name Storageset Uses Used by S1 stripeset M1 D4 M2 Switches CHUNKSIZE 256 blocks State NORMAL M1 member 0 is NORMAL M2 member 1 is NORMAL Size 142229246 blocks See Also ADD STRIPESETS DELETE container name SHOW STRIPESETS SHOW stripeset name ...

Page 202: ... known to the subsystem Syntax SHOW UNITS Parameters There are no parameters associated with this command Switches The following switch is available for the SHOW UNITS command FULL Example BOT show units LUN Uses Used by D0 R0 D1 DISK10300 D2 M3 D3 S2 See Also ADD UNITS DELETE unit number SET unit number SHOW unit number SHOW UNITS ...

Page 203: ...face Reference Guide 2 187 SHOW unit number Displays information about the specified unit Syntax SHOW unit number Parameters unit number Specifies the unit to be displayed Switches There are no switches associated with this command SHOW unit number ...

Page 204: ...475 0005 NOIDENTIFIER Switches RUN NOWRITE_PROTECT READ_CACHE READAHEAD_CACHE WRITEBACK_CACHE MAX_READ_CACHED_TRANSFER_SIZE 32 MAX_WRITE_CACHED_TRANSFER_SIZE 32 Access ALL State ONLINE to this controller Not reserved NOPREFERRED_PATH Host Based Logging NOT Specified Size 35529666 blocks Geometry C H S 10512 20 169 See Also ADD UNITS DELETE unit number SET unit number SHOW UNITS ...

Page 205: ... controller command IGNORE_ERRORS and NOIGNORE_ERRORS IMMEDIATE_SHUTDOWN and NOIMMEDIATE_SHUTDOWN These switches are described in the following paragraphs IGNORE_ERRORS NOIGNORE_ERRORS default Controls the controller reaction based on the status of write back cache CAUTION The IGNORE_ERRORS switch causes the controller to keep unflushed data in the write back cache until it restarts and is able to...

Page 206: ... Specify IMMEDIATE_SHUTDOWN to cause the controller to shutdown immediately without checking for online devices or before flushing data from the write back cache to devices Specify NOIMMEDIATE_SHUTDOWN to cause the controller not to shutdown without checking for online devices or before all data has been flushed from the write back cache to devices Examples To shut down this controller enter SHUTD...

Page 207: ... target Syntax SITE_FAILOVER remote node name remote copy set name Parameters remote node name remote copy set name The remote node name part of the parameter specifies the name of the controller pair called a node receiving the command The remote copy set name part of the parameter specifies the name by which the remote copy set is known This name must be unique across the fabric NOTE Remote copy...

Page 208: ...es the mirrorset capacity is limited to the size of the smallest member larger members contain unused capacity If a member with unused capacity is the last remaining member of a mirrorset the UNMIRROR command cannot be used to change the disk drive back to a single disk unit This change would cause a change in the reported disk capacity possibly corrupting user data Syntax UNMIRROR disk name Param...

Page 209: ...of the bus AL_PA Arbitrated loop physical address A one byte value used to identify a port in an Arbitrated Loop topology ANSI Pronounced ann see Acronym for the American National Standards Institute An organization who develops standards used voluntarily by many manufacturers within the USA ANSI is not a government agency arbitrated loop In Fibre Channel Technology a serial bus configuration in w...

Page 210: ...ecified time relation See also synchronous autospare A controller feature that automatically replaces a failed disk drive Autospare aids the controller in automatically replacing failed disk drives You can enable the AUTOSPARE switch for the failedset causing physically replaced disk drives to be automatically placed into the spareset Also called autonewspare backplane The electronic printed circu...

Page 211: ... from an input device built in self test See BIST byte A binary character string made up of 8 bits operated on as a unit cache memory A portion of memory used to accelerate read and write operations The objective of caching data in a system is to improve performance by placing the most frequently used data in the highest performance memory CDU Cable distribution unit The power entry device for Sto...

Page 212: ...onnect the nodes in a clustered subsystem CLCP Code Load Code Patch utility This utility can be used to download patches to the Array Controller Software CLI Command Line interface A command line entry utility used to interface with the HS series controllers CLI enables the configuration and monitoring of a storage subsystem through textual commands coax or coaxial cable A two conductor wire in wh...

Page 213: ... the mirrorset after the mirrorset is created is regarded as a copying member Once all the data from the normal member or members is copied to a normalizing or copying member the copying member then becomes a normal member See also normalizing member CSR Control and Status Register DAEMON Pronounced demon A program usually associated with a UNIX system that performs a utility housekeeping or maint...

Page 214: ...dule A 16 bit I O module with SCSI bus converter circuitry for extending a differential SCSI bus See also I O module differential SCSI bus A bus in which a signal level is determined by the potential difference between two wires A differential bus is more robust and less subject to electrical noise than is a single ended bus DILX Disk Inline Exerciser DILX is a diagnostic used to test the data tra...

Page 215: ...vices dual simplex A communications protocol that allows simultaneous transmission in both directions in a link usually with no flow control DUART Dual Universal Asynchronous Receiver and Transmitter An integrated circuit containing two serial asynchronous transceiver circuits DWZZA A StorageWorks SCSI bus signal converter used to connect 8 bit single ended devices to hosts with 16 bit differentia...

Page 216: ...conditions such as failed power supplies failed blowers elevated temperatures and external air sense faults The EMU also controls certain cabinet hardware including DOC chips alarms and fan speeds environmental monitoring unit See EMU ESD Electrostatic Discharge The discharge of potentially harmful static electrical voltage as a result of improper grounding extended subsystem A subsystem in which ...

Page 217: ...laced See also failback fault management utility See FMU FC AL The Fibre Channel Arbitrated Loop standard FC ATM ATM AAL5 over Fibre Channel FCC Federal Communications Commission The federal agency responsible for establishing standards and approving electronic devices within the United States FCC Class A This certification label appears on electronic devices that can only be used in a commercial ...

Page 218: ...er Distributed Data Interface An ANSI standard for 100 megabaud transmission over fiber optic cable FG FP Fibre Channel Framing Protocol HIPPI on FC fiber A fiber or optical strand Spelled fibre in Fibre Channel fiber optic cable A transmission medium designed to transmit digital signals in the form of pulses of light Fiber optic cable is noted for its properties of electrical isolation and resist...

Page 219: ... time full duplex n A communications system in which there is a capability for 2 way transmission and acceptance between two sites at the same time FWD SCSI A fast wide differential SCSI bus with a maximum 16 bit data transfer rate of 20 MB s See also SCSI FD SCSI GBIC Gigabit Interface Converter The devices that are inserted into the ports of the Fibre Channel switch and that hold the Fibre Chann...

Page 220: ...patibility mode A setting used by the controller to provide optimal controller performance with specific operating systems This improves the controller performance and compatibility with the specified operating system hot disks A disk containing multiple hot spots Hot disks occur when the workload is poorly distributed across storage devices which prevents optimum subsystem performance See also ho...

Page 221: ...r visa versa the actual transfer of the data and the processing and overlaying activity to make the request and transfer occur initiator A SCSI device that requests an I O process to be performed by another SCSI device namely the SCSI target The controller is the initiator on the device bus The host is the initiator on the host bus instance code A 4 byte value displayed in most text error messages...

Page 222: ...e controller serial maintenance port to a maintenance terminal or the host terminal A local connection enables you to connect to one subsystem controller to perform maintenance tasks See also maintenance terminal local terminal local terminal A terminal plugged into the EIA 423 maintenance port located on the front bezel of the controller See also maintenance terminal local connection logical bus ...

Page 223: ...ted with a physical device unit during a task s I O operations Each task in the system must establish its own correspondence between logical unit numbers and physical devices See also logical unit maintenance terminal An EIA 423 compatible terminal used with the controller This terminal is used to identify the controller enable host paths enter configuration information and check the controller s ...

Page 224: ...he act of creating an exact copy or image of data mirrorset See RAID level 1 MIST Module Integrity Self Test MSCP Mass Storage Control Protocol MSCP is the protocol by which blocks of information are transferred between the host and the subsystem controller on the CI bus multibus failover Allows the host to control the failover process by moving the unit s from one controller to another N_Port A p...

Page 225: ...uration that does not include a second controller normal member A mirrorset member that block for block contains the same data as other normal members within the mirrorset Read requests from the host are always satisfied by normal members normalizing A state in which block for block data written by the host to a mirrorset member is consistent with the data on other normal and normalizing members T...

Page 226: ...AIDsets use parity to improve the availability of data parity bit A binary digit added to a group of bits that checks to see if errors exist in the transmission parity check A method of detecting errors when data is sent over a communications line With even parity the number of ones in a set of binary data should be even With odd parity the number of ones should be odd parity RAID See RAIDset part...

Page 227: ...ftware used to connect a host controller to a communications bus such as a SCSI bus or serial bus Regarding the controller the port is 1 The logical route for data in and out of a controller that can contain one or more channels all of which contain the same type of data 2 The hardware and software that connects a controller to a SCSI device port_name A 64 bit unique identifier assigned to each Fi...

Page 228: ...excellent this RAID level is the only one that does not provide redundancy Raid level 0 storagesets are referred to as stripesets RAID level 0 1 A RAID storageset that stripes data across an array of disks RAID level 0 and mirrors the striped data RAID level 1 to provide high I O performance and high availability Raid level 0 1 storagesets are referred to as striped mirrorsets RAID level 1 A RAID ...

Page 229: ...ponse time to a read request by allowing the controller to satisfy the request from the cache memory rather than from the disk drives read ahead caching A caching technique for improving performance of synchronous sequential reads by prefetching data from disk reconstruction The process of regenerating the contents of a failed member s data The reconstruct process writes the data to a spareset dis...

Page 230: ...ly and one located remotely for long distance mirroring The units can be a single disk or a storageset mirrorset or RAIDset A unit on the local controller is designated as the initiator and a corresponding unit on the remote controller is designated as the target See also association set replacement policy The policy specified by a switch with the SET FAILEDSET command indicating whether a failed ...

Page 231: ...hrough 15 for a 16 bit bus See also target ID number SCSI ID number The representation of the SCSI address that refers to one of the signal lines numbered 0 through 15 SCSI port 1 Software The channel controlling communications to and from a specific SCSI bus in the system 2 Hardware The name of the logical socket at the back of the system unit to which a SCSI device is connected SCSI A cable A 50...

Page 232: ...tion of disk drives used by the controller to replace failed members of a storageset star coupler The physical hub of the CI cluster subsystem cabling The star coupler is a set of connection panels contained within a cabinet containing cable connections and transformers through which the nodes of a cluster connect to one another through the CI bus See also node and CI bus storage array An integrat...

Page 233: ...o form storage subsystems StorageWorks systems include integrated devices and array controllers to form storage subsystems stripe The data divided into blocks and written across two or more member disks in an array stripe size The stripe capacity as determined by n 1 times the chunksize where n is the number of RAIDset members striped mirrorset See RAID level 0 1 stripeset See RAID level 0 stripin...

Page 234: ... your current CLI session through a local or remote terminal See also other controller TILX Tape inline exerciser The controller diagnostic software to test the data transfer capabilities of tape drives in a way that simulates a high level of user activity topology An interconnection scheme that allows multiple Fibre Channel ports to communicate with each other For example point to point Arbitrate...

Page 235: ... A battery powered power supply guaranteed to provide power to an electrical device in the event of an unexpected interruption to the primary power supply Uninterruptible power supplies are usually rated by the amount of voltage supplied and the length of time the voltage is supplied VHDCI Very High Density Cable Interface A 68 pin interface that is required for Ultra SCSI connections virtual term...

Page 236: ...sts by allowing the controller to declare the write operation complete as soon as the data reaches its cache memory The controller performs the slower operation of writing the data to the disk drives at a later time write through cache A cache management technique for retaining host write requests in read cache When the host requests a write operation the controller writes data directly to the sto...

Page 237: ...ters ADAPTER_ID 2 7 connection name 2 7 CONTROLLER 2 7 HOST_ID 2 7 PORT 2 7 physically connecting 2 6 switches OPERATING_SYSTEM 2 8 RESERVATION_STYLE 2 9 UNIT_OFFSET 2 9 syntax 2 6 ADD DISKS command parameters 2 12 description 2 12 parameters disk name 2 12 scsi port target lun 2 12 related commands ADD PASSTHROUGH 2 14 ADD UNITS 2 14 DELETE container name 2 14 INITIALIZE 2 14 LOCATE 2 14 SET cont...

Page 238: ...ame 2 20 RAIDset name 2 20 related commands ADD UNITS 2 23 DELETE container name 2 23 INITIALIZE 2 23 SET RAIDSETS 2 23 SHOW RAIDset name 2 23 SHOW RAIDSETS 2 23 STORAGESETS 2 23 switches NOPOLICY 2 21 NOREDUCED 2 22 POLICY 2 21 RECONSTRUCT 2 21 REDUCED 2 22 syntax 2 20 ADD REMOTE_COPY_SETS command parameters 2 24 description 2 24 parameters initiator unit name 2 24 remote copy set name 2 24 remot...

Page 239: ...AD_CACHED_TRANSFER_ SIZE 2 35 MAX_WRITE_CACHED_TRANSFER_ SIZE 2 36 MAXIMUM_CACHED_TRANSFER_ SIZE 2 36 NOPREFERRED_PATH 2 36 NOREAD_CACHE 2 37 NOREADAHEAD_CACHE 2 37 NORUN 2 38 NOWRITE_PROTECT 2 39 NOWRITEBACK_CACHE 2 40 PARTITION 2 36 PREFERRED_PATH 2 36 READ_CACHE 2 37 READAHEAD_CACHE 2 37 RUN 2 38 WRITE_LOG 2 38 WRITE_PROTECT 2 39 WRITEBACK_CACHE 2 40 syntax 2 32 ADD switch for SET association s...

Page 240: ...ntion policy 2 43 related commands CLEAR_ERRORS CLI 2 44 LOST_DATA 2 44 UNKNOWN 2 44 UNWRITEABLE_DATA 2 44 syntax 2 43 CLEAR_ERRORS device name UNKNOWN command parameters 2 45 description 2 45 parameters device name 2 45 related commands CLEAR_ERRORS CLI 2 45 INVALID_CACHE 2 45 UNWRITEABLE_DATA 2 45 syntax 2 45 CLEAR_ERRORS unit number LOST_DATA command parameters 2 46 description 2 46 parameter u...

Page 241: ...RTITION 2 55 DELETE associations 2 58 concatsets 2 59 connection name 2 60 container name 2 62 FAILEDSETS 2 64 remote copy set name 2 65 SPARESETS 2 66 unit number 2 67 DESTROY_PARTITION 2 69 DIRECTORY 2 71 EXIT 2 72 HELP 2 73 INITIALIZE 2 74 LOCATE 2 79 MIRROR 2 81 POWEROFF 2 84 REDUCE 2 87 RENAME 2 90 RESTART controller 2 91 RETRY_ERRORS unit number UNWRITEABLE_DATA 2 93 RUN 2 94 SELFTEST contro...

Page 242: ...ompaq authorized reseller viii technical support vii website viii concantenation set See ADD CONCATSETS concatset name parameter for ADD CONCATSETS 2 4 DELETE concatsets 2 59 SET concatsets 2 102 CONCATSETS description 2 156 concatsets showing 2 182 CONFIG running 2 94 configuration modifying controller configurations resetting 2 50 restoring 2 52 2 76 CONFIGURATION RESET description 2 50 related ...

Page 243: ...enu sequences defined v system responses defined v user input defined v variables v website addresses v COPY switch for ADD MIRRORSETS 2 16 MIRROR 2 82 SET FAILOVER COPY 2 128 mirrorset name 2 130 MULTIBUS_FAILOVER 2 134 CREATE_PARTITION command parameters 2 55 description 2 55 parameter container name 2 55 related commands ADD UNITS 2 57 DELETE unit number 2 57 DESTROY PARTITION 2 57 SET unit num...

Page 244: ... remote copy set name command parameters 2 65 description 2 65 parameter remote copy set name 2 65 related commands ADD REMOTE_COPY_SETS 2 65 SET remote copy set name 2 65 syntax 2 65 DELETE SPARESETS command parameters 2 66 description 2 66 parameter disk name 2 66 related commands ADD SPARESETS 2 66 SHOW SPARESETS 2 66 syntax 2 66 DELETE unit number command parameters 2 67 description 2 67 param...

Page 245: ...ce data transfer rate 2 13 transfer rate 2 13 disk name parameter for ADD DISKS 2 12 MIRRORSETS 2 15 RAIDSETS 2 20 SPARESETS 2 29 DELETE FAILEDSETS 2 64 DELETE SPARESETS 2 66 MIRROR 2 81 REDUCE 2 88 UNMIRROR 2 192 DISKS parameter for LOCATE 2 80 document conventions v DRM CLI commands ADD ASSOCIATIONS 2 2 ADD REMOTE_COPY_SETS 2 24 SET remote copy set name 2 141 SITE_FAILOVER 2 191 DSTAT running 2 ...

Page 246: ...ULL switch for SHOW STRIPESETS 2 184 FULL switch for SHOW UNIT 2 186 G geometry switches for INITIALIZE 2 75 getting help vii Compaq technical support vii Compaq website viii H HEADS switch for INITIALIZE 2 75 HELP description 2 73 syntax 2 73 help obtaining vii HOST_ID parameter for ADD CONNECTIONS 2 7 hot surface symbol and definition vi HSUTIL running 2 95 I IDENTIFIER switch for SET controller...

Page 247: ...ER_SIZE switch for ADD UNITS 2 35 SET unit number 2 147 MAX_WRITE_CACHED_TRANSFER_SIZE switch for ADD UNITS 2 36 SET unit number 2 147 MAXIMUM_CACHED_TRANSFER_SIZE switch for ADD UNITS 2 36 SET unit number 2 147 MEMBERSHIP switch for SET mirrorset name 2 131 menu items convention defined v sequences convention defined v MIRROR command parameters 2 81 description 2 81 parameters disk name 2 81 mirr...

Page 248: ...er 2 91 SELFTEST controller 2 98 SHUTDOWN controller 2 190 NOLOG_UNIT switch for SET association set name 2 100 NOMIRRORED_CACHE switch for SET controller 2 110 NOORDER_ALL switch for SET association set name 2 101 NOPOLICY switch for ADD MIRRORSETS 2 16 ADD RAIDSETS 2 21 MIRROR 2 82 SET mirrorset name 2 131 SET RAIDset name 2 138 NOPREFERRED_PATH switch for ADD UNITS 2 36 SET unit number 2 148 NO...

Page 249: ...disk name 2 15 mirrorset name 2 15 ADD PASSTHROUGH passthrough name 2 18 scsi port target lun 2 18 ADD RAIDSETS disk name 2 20 RAIDset name 2 20 ADD REMOTE_COPY_SETS initiator unit name 2 24 remote copy set name 2 24 remote node name target unit name 2 25 ADD SNAPSHOT_UNITS snapshot unit 2 27 source unit 2 28 storageset name 2 27 ADD SPARESETS disk name 2 29 ADD STRIPESETS container name 2 30 stri...

Page 250: ...passthrough name 2 18 PORT 2 7 program name 2 94 ptl scsi port target lun 2 80 RAIDset name 2 20 2 138 REDUCE disk name 2 88 REJECTED_HOST 2 8 remote copy set name 2 2 2 24 2 65 2 141 2 191 remote node name 2 191 remote node name target unit name 2 25 RENAME new container name 2 90 old container name 2 90 RESTART controller controller 2 91 RETRY_ERRORS unit number UNWRITEABLE_DATA unit number 2 93...

Page 251: ... NO_OVERRIDE_BAD_FLUSH 2 84 OVERRIDE_BAD_FLUSH 2 84 SECONDS 2 85 syntax 2 84 PREFERRED_PATH switch for ADD UNITS 2 36 SET unit number 2 148 program name parameter for RUN 2 94 prompt CLI See CLI prompt 1 8 PROMPT switch for SET controller 2 113 ptl parameter for LOCATE 2 80 purging a controller old configuration information 2 52 R rack stability warning vii RAIDset name parameter for ADD RAIDSETS ...

Page 252: ...VE switch for SET mirrorset name 2 132 SET RAIDset name 2 139 SET remote copy set name 2 143 RENAME command parameters 2 90 description 2 90 parameters new container name 2 90 old container name 2 90 syntax 2 90 renaming 2 90 REPLACE switch for SET mirrorset name 2 132 SET RAIDset name 2 139 RESERVATION_STYLE switch for ADD CONNECTIONS 2 9 SET connection name 2 105 resetting configuration 2 50 RES...

Page 253: ... 2 98 switches IGNORE_ERRORS 2 97 IMMEDIATE_SHUTDOWN 2 98 NOIGNORE_ERRORS 2 97 NOIMMEDIATE_SHUTDOWN 2 98 syntax 2 97 SENSOR_n_SETPOINT switch for SET EMU 2 121 SET association set name command parameters 2 99 description 2 99 parameter association set name 2 99 related commands ADD ASSOCIATIONS 2 101 ADD REMOTE_COPY_SET 2 101 SET remote copy set name 2 101 switches ADD 2 99 FAIL_ALL 2 99 LOG_UNIT ...

Page 254: ... device name command parameters 2 118 description 2 118 parameter device name 2 118 related commands ADD DISKS 2 119 SHOW DEVICES 2 119 SHOW DISKS 2 119 switches NOTRANSPORTABLE 2 118 TRANSFER_RATE_REQUESTED 2 118 TRANSPORTABLE 2 118 syntax 2 118 SET DISABLE_MANAGERS description 2 123 SET EMU description 2 120 related command SHOW 2 123 switches ALARM 2 120 FANSPEED 2 120 SENSOR_n_SETPOINT 2 121 s...

Page 255: ...NFLUSHABLE_DATA 2 136 NODESTROY_UNFLUSHABLE_DAT A 2 136 syntax 2 136 SET RAIDset name command parameters 2 138 description 2 138 parameter RAIDset name 2 138 related commands ADD RAIDSETS 2 140 SHOW RAIDSETS 2 140 switches NOPOLICY 2 138 POLICY 2 138 RECONSTRUCT 2 139 REMOVE 2 139 REPLACE 2 139 syntax 2 138 SET remote copy set name command parameters 2 141 description 2 141 parameter remote copy s...

Page 256: ...source 2 16 2 132 spareset replacement policy 2 131 nofailover cached data policy 2 136 number of blocks cached by controller 2 36 2 147 mirrorset members 2 131 unit partitions 2 36 number of blocks cached by controller 2 36 2 147 partition size 2 43 2 56 RAIDsets member reconstruct policy 2 21 2 139 member replacement policy 2 16 2 21 2 132 read cache for units 2 37 2 148 storageset chunksize 2 7...

Page 257: ...7 SHOW MANAGERS description 2 168 syntax 2 168 SHOW mirrorset name syntax 2 171 SHOW mirrorset name command parameters 2 171 description 2 171 SHOW MIRRORSETS description 2 170 switch FULL 2 170 syntax 2 170 SHOW PASSTHROUGH description 2 173 switch FULL 2 173 syntax 2 173 SHOW raidset name syntax 2 176 SHOW raidset name command parameters 2 176 RAIDSETS description 2 176 SHOW RAIDSETS description...

Page 258: ...TE_PARTITION 2 56 snapshot unit parameter for ADD SNAPSHOT_UNITS 2 27 source unit parameter for ADD SNAPSHOT_UNITS 2 28 sparesets adding to configuration 2 29 removing a disk drive 2 66 showing 2 182 storageset expansion See ADD CONCATSETS 2 4 storageset name parameter for ADD CONCATSETS 2 4 ADD SNAPSHOT_UNITS 2 27 storagesets general commands 1 4 initializing 2 74 locating 2 79 renaming 2 90 show...

Page 259: ..._CLASS 2 108 AUTOSPARE 2 126 BATTERY_OFF 2 84 BATTERY_ON 2 84 CACHE_FLUSH_TIMER 2 109 CAPACITY 2 75 CHUNKSIZE 2 75 COMMAND_CONSOLE_LUN 2 109 CONNECTIONS_LOCKED 2 109 CONNECTIONS_UNLOCKED 2 109 COPY 2 16 2 82 2 130 CREATE_PARTITION SIZE 2 56 CYLINDERS 2 75 DESTROY 2 76 DISABLE_ACCESS_PATH 2 34 2 146 DISABLE_MANAGERS 2 125 ENABLE_ACCESS_PATH 2 34 2 146 ENABLE_MANAGERS 2 125 ERROR_MODE 2 142 FAIL_ALL...

Page 260: ...R_ALL 2 101 OUTSTANDING_IOS 2 25 2 142 OVERRIDE_BAD_FLUSH 2 84 PARTITION 2 34 POLICY 2 16 2 21 2 82 2 131 2 138 PORT_n_AL_PA 2 112 PORT_n_TOPOLOGY 2 113 POWEROFF BATTERY_OFF 2 84 BATTERY_ON 2 84 NO_OVERRIDE_BAD_FLUSH 2 84 OVERRIDE_BAD_FLUSH 2 84 SECONDS 2 85 PREFERRED_PATH 2 34 2 148 PROMPT 2 113 READ_CACHE 2 34 2 148 READ_SOURCE 2 16 2 132 READAHEAD_CACHE 2 34 2 149 RECONSTRUCT 2 21 2 139 REDUCED...

Page 261: ...BLE 2 118 SET EMU ALARM 2 120 FANSPEED 2 120 SENSOR_n_SETPOINT 2 121 SET FAILEDSET AUTOSPARE 2 126 NOAUTOSPARE 2 126 SET FAILOVER COPY COPY 2 128 SET mirrorset name COPY 2 130 MEMBERSHIP 2 131 NOPOLICY 2 131 POLICY 2 131 READ_SOURCE 2 132 REMOVE 2 132 REPLACE 2 132 SET MULTIBUS_FAILOVER COPY 2 134 SET NOFAILOVER DESTROY_UNFLUSHABLE_DATA 2 136 NODESTROY_UNFLUSHABLE_DAT A 2 136 SET NOMULTIBUS_FAILOV...

Page 262: ...ESETS FULL 2 184 SHOW UNIT FULL 2 186 SHUTDOWN controller IGNORE_ERRORS 2 189 IMMEDIATE_SHUTDOWN 2 190 NOIGNORE_ERRORS 2 189 NOIMMEDIATE_SHUTDOWN 2 190 SIZE 2 56 SMART_ERROR_EJECT 2 114 SUSPEND 2 143 TERMINAL_PARITY 2 115 TERMINAL_SPEED 2 115 TIME 2 115 TRANSFER_RATE_REQUESTED 2 13 2 19 2 118 TRANSPORTABLE 2 13 2 118 UNIT_OFFSET See also SET connection name 2 105 UNIT_OFFSET See also ADD CONNECTIO...

Page 263: ...r 2 145 SHOW ASSOCIATIONS 2 153 SHOW association set name 2 154 SHOW concatset name 2 156 SHOW CONCATSETS 2 155 SHOW connection name 2 159 SHOW CONNECTIONS 2 157 SHOW controller 2 160 SHOW DEVICES 2 162 SHOW disk name 2 164 SHOW DISKS 2 163 SHOW EMU 2 165 SHOW FAILEDSETS 2 166 SHOW ID 2 167 SHOW MANAGERS 2 168 SHOW mirrorset name 2 171 SHOW MIRRORSETS 2 170 SHOW PASSTHROUGH 2 173 SHOW raidset name...

Page 264: ... 2 145 units adding to configuration 2 32 changing characteristics 2 145 clearing lost data error 2 46 deleting from the configuration 2 67 displaying configured units 2 186 2 187 mirroring 2 81 naming with ADD command 2 34 UNITS parameter for LOCATE 2 80 UNMIRROR command parameters 2 192 description 2 192 parameter disk name 2 192 related commands ADD MIRRORSET 2 192 MIRROR 2 192 REDUCE 2 192 RUN...

Page 265: ...torage viii Compaq technical support vii write requests improving the subsystem response time with write back caching 2 151 placing data with write through caching 2 40 2 151 See also read requests WRITE_LOG switch for ADD UNITS 2 38 SET unit number 2 149 WRITE_PROTECT switch for ADD UNITS 2 39 SET unit number 2 151 write back caching setting the flush timer 2 109 WRITEBACK_CACHE switch for ADD UN...

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