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Gateway E-842R, User Manual

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Contents

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Chapter 4: Configuring your storage solution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39

Using the Storage Assistant   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Assisted automatic configuration   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Manually configuring a storage solution  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44

Creating disk arrays  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Creating the array   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Initializing the array  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Pausing and resuming the initialization   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Adding hot spare drives   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
Creating a logical drive   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  56
Saving the configuration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  58

Chapter 5: SAN LUN Mapping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  61

Overview  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  62
Terminology   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Accessing SAN LUN mapping  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  62
Overview of the SAN LUN mapping window  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

HBA Ports Name section  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
ADD NEW MAP section   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  65
SELECTED HOST HBA PORT CONNECTION Section  . . . . . . . . . . . . . . . . . . . 65

Creating a SAN LUN mapping   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Deleting a SAN LUN mapping   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Modifying a SAN LUN mapping  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Chapter 6: Controller Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  71

Controller environmentals  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  72

Overview  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Controller environmentals   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Operations   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  74

Controller advanced settings   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Overview  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Advanced settings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  76

Chapter 7: Managing the Storage Solution  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  81

Advanced array functions   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  82

Deleting an array   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  82
Modifying arrays  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  83
Verifying parity   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Identifying drive members  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Rebuilding an array  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Expanding an array  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  87
Trusting an array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  89

Restoring and clearing the configuration   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Restoring the configuration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  91
Clearing the configuration   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Summary of Contents for E-842R

Page 1: ...USER GUIDE Gateway E 842R StorView Storage Management Application ...

Page 2: ......

Page 3: ...platforms 13 Embedded StorView initial setup 14 Setting up the Embedded StorView Module in Microsoft Windows 14 Setting up the Embedded StorView Module in Linux 16 Chapter 3 Getting Started 17 The work area 18 The tool bar 18 Enclosure section 19 Array and logical drive section 24 Server sidebar section 26 Embedded StorView setup 28 Embedded network settings 28 Starting StorView 29 Upgrading the l...

Page 4: ...w 64 HBA Ports Name section 64 ADD NEW MAP section 65 SELECTED HOST HBA PORT CONNECTION Section 65 Creating a SAN LUN mapping 65 Deleting a SAN LUN mapping 67 Modifying a SAN LUN mapping 68 Chapter 6 Controller Information 71 Controller environmentals 72 Overview 72 Controller environmentals 72 Operations 74 Controller advanced settings 75 Overview 75 Advanced settings 76 Chapter 7 Managing the St...

Page 5: ...rol monitoring 102 Rescan 103 Appendix A Troubleshooting and Support 105 Troubleshooting 106 Problems you may encounter 106 Support and updates 110 Tech support 110 Updating Embedded StorView software 111 Telephone support 112 Before calling Gateway Customer Care 112 Telephone numbers 112 Self help 113 Notices 113 Appendix B Event Logs 115 Overview 116 Accessing and navigating the StorView event l...

Page 6: ...stics 141 Read Ahead statistics 143 Command cluster statistics 144 Appendix D Optimizing RAID 5 Write Performance 147 Introduction 148 Sequential access 148 Number of outstanding commands 149 Access size 149 Access alignment 149 RAID 5 sub array 150 Multiple drive failures 150 Faster rebuild 151 Summary 151 Index 153 ...

Page 7: ...CHAPTER 1 1 Introduction Overview Inter server communication License manager ...

Page 8: ...unication Multicast StorView s server component uses multicasting technology to provide inter server communication with other servers when the Global Access license is installed During the server s initial start up it performs a multicast registration using the default multicast IP address of 225 0 0 225 on port 9191 After registration is complete the server can receive all packets sent to the mul...

Page 9: ...itoring of the locally attached storage solution The Remote Access is the default license included with the embedded version It provides the same functions as the Local Access license and it adds support for server failover and remote login Remote Access does not support features such as e mail notices and SNMP However it does offer an upgrade path to the Global Access license The Global Access li...

Page 10: ...Chapter 1 Introduction www gateway com 4 ...

Page 11: ...CHAPTER 2 5 Installation Setup for Microsoft Windows platforms Setup for Linux platforms ...

Page 12: ...1 or greater Web browser software that is HTTP 1 1 compliant and that supports JavaScript 1 3 or later such as Microsoft Internet Explorer 5 5 or greater Netscape 7 0 or greater Mozilla 1 1 or greater or Opera 7 11 or greater 100 MB hard drive space Network adapter or a Microsoft Loop Back Adapter software for local attachments when a Host Bus Adapter HBA is not installed Gateway E 842R Series sto...

Page 13: ...Setup for Microsoft Windows platforms www gateway com 7 3 To continue with installation click Install The Welcome window opens 4 Click Next to continue The License Agreement dialog box opens ...

Page 14: ... free without the requirement of a serial number or activation code It lets you configure manage and monitor your storage system attached to your local host computer The Global manager requires a serial number and activation code The Global manager lets you perform remote login management and monitoring and monitoring failover capabilities plus e mail alert notifications 7 If you selected the Glob...

Page 15: ... user name or password and they are case sensitive Be sure to write down the user name and password because they are required to log into StorView In this example we used admin 8 Enter the user name and password then click Next to continue The Choose Destination Location dialog box opens 9 Select the directory for the software installation the default directory is C Program Files StorView then cli...

Page 16: ...HTTP localhost 9292 Upgrading StorView on Windows platforms To upgrade the software 1 Insert the Gateway External Backup CD EBCD into your CD drive The autorun program automatically starts the Gateway Driver and Application Recovery menu 2 Select the StorView software 3 Click Install 4 When you are prompted to completely remove the previous version of the application click OK to continue After the...

Page 17: ...pens 13 Click Next The CompletetheAdd RemoveHardwareWizard window opens 14 Click Finish to complete the installation Prompted driver installation To install the driver when prompted 1 If the Found New Hardware Wizard opens at startup click Next to install the driver The Install Hardware Device Drivers window opens 2 Click Display a list of the known drivers for this device so that I can choose a s...

Page 18: ...tall and use StorView on Linux A Gateway server with an Intel processor 128 MB RAM CD drive 256 color video adapter minimum display settings should be 1024 x 768 Operating systems Red Hat Enterprise Linux AS ES RHEL 3 4 or SuSE Linux Enterprise Server 8 and 9 Web browser software that is HTTP 1 1 compliant and supports JavaScript 1 3 such as Mozilla 1 1 or greater or Konqueror 3 1 or greater 100 M...

Page 19: ...s are provided to manage StorView opt StorView StartStorView opt StorView StopStorView etc rc d init d StorView start stop The directory where the software installs is the opt StorView directory 9 To start StorView and the Apache Web server type StartStorView 10 To stop StorView and the Apache Web server type StopStorView 11 To determine if StorView is running type ps ef grep i StorView Look for a...

Page 20: ...lies with UDP packets containing their information A list of uninitialized systems is displayed Uninitialized systems are those which have not had the default user name and password changed If you create a configuration with arrays and logical drives but you have not changed the login name and password the system is still be considered an uninitialized system During the process of configuring an E...

Page 21: ...ll discovered embedded modules have had their default passwords changed the Initialized window opens 5 From the Uninitialized window select the MAC address of the embedded module you want to configure If you want to use a DHCP server to assign your IP address click Use DHCP If you want to manually configure your network setting enter the correct information in the appropriate fields 6 Enter a new ...

Page 22: ...ress of the embedded module you want to start then click Launch StorView Your default Web browser opens with a login screen 9 Enter the login name and new password then click OK The Main window opens Setting up the Embedded StorView Module in Linux To set up the Embedded StorView Module in Linux 1 Log in as root 2 Insert the External Backup CD into your CD drive 3 Change directories to the softwar...

Page 23: ...CHAPTER 3 17 GettingStarted The work area Array and logical drive section Embedded StorView setup Starting StorView Upgrading the license E mail SNMP Changing the password Monitoring settings ...

Page 24: ...ns include creating disk arrays logical drives LUN mapping and assignment of spare drives You also have access to advanced features that allow for array and logical drive expansion optimizing controller parameters rebuilding arrays managing E mail notices of events and SNMP traps reviewing event logs and analyzing system statistics The tool bar These icon buttons appear at the top of the work area...

Page 25: ...ive window where you create new logical drives SAN Mapping This button opens the SANLUNMapping window where you can further customize logical drive availability Logical Drive Statistics This button opens the Statistics window Advanced Settings This button opens a window from which you can change controller parameters Archive Configuration This button opens a window from which you can choose to sav...

Page 26: ...lerant state Updating Firmware The subject drive s firmware is being updated Failed Array Member This icon appears on all disk drives that are members of an array that has failed For example if you remove a drive from a RAID 0 array or a drive in that array fails the remaining drive members have this icon displayed to indicate that the array has failed If you accidentally remove the wrong drive in...

Page 27: ...on with Failure displayed indicates that the subject power supply has failed A solid red icon indicates that the power supply is missing Unknown This icon indicates the enclosure power supply information from the SES processor or SAF TE processes is missing or invalid RAID Controller icon Animated RAID Controller icons are displayed on the Main window rear view image of the enclosure and change co...

Page 28: ... normal the temperature sensor may be faulty Missing This icon indicates that the information from the SES SAF TE regarding the sensors is invalid or missing Enclosure icon RAID Storage Solution Enclosure icons are displayed at the bottom of the Main window and change shades according to enclosures state as well as the state of the individual components The enclosures are labeled above each front ...

Page 29: ...e icon see the Enclosure section on page 19 To locate the enclosure 1 On the Main window click Locate The following window appears 2 Click GO to begin flashing the blue ID LED Click CLOSE to cancel 3 After the locate function has expired a message tells you that the command was executed successfully Click CLOSE to close the message Mixed drive types If you have installed a mixture of drive types i...

Page 30: ...he following warning message appears and you cannot proceed Passing the mouse pointer over the drives in the enclosure view displays information about the drive including its type This makes it easier to locate the group of drives in a column where the mismatch of types exists Swap the drives with like types to remove the warning message You may want to click RESCAN to help StorView detect the cor...

Page 31: ... failed RAID 1 10 Two drives have failed from the same pair RAID 5 Two drives have failed RAID 50 Two drives have failed within the same sub array Logical Drive Status icon These icons are found in the Logical Drive section and depict the current state of the specific component Green Status is OK Yellow Indicates the logical drive is part of an array that is degraded Red Indicates thelogicaldrivei...

Page 32: ...server components by changing its color and state Normal Gray Status is OK Flashing Yellow Indicates a server warning that a connected device is in degraded mode Flashing Red Indicates a server error or device malfunction Remote StorView Servers icon Global License Normal Gray Status is OK Flashing Yellow Indicates a server warning that a connected device is in degraded mode Flashing Red Indicates...

Page 33: ...ates that the storage solution was there at startup but now cannot be located Storage Solution Unmonitored This icon indicates that another StorView server is monitoring this storage solution or if you just performed a rescan the StorView servers are still determining which StorView server takes control of the monitoring of the storage solution Controller icon This icon represents the RAID Control...

Page 34: ... in your DHCP Manager software If an IP address cannot be determined StorView uses a default IP address of 10 1 1 5 for controller 0 and 10 1 1 6 for controller 1 If an error is encountered StorView assigns the Embedded StorView Server the IP address 10 1 1 7 The first time you start StorView you should configure the network settings Configuring network settings To configure network settings 1 Cli...

Page 35: ...r click in the Default Gateway field 4 Enter the gateway or router address you want then TAB or click in the DNS Server field 5 Enter the DNS Server IP address you want then click APPLY to make the changes effective 6 Click CLOSE to exit Getting a New IP Address If you are set up to receive your IP address using Dynamic IP DHCP you can force the Embedded StorView server to obtain a new IP address ...

Page 36: ...edded license installed you are limited to local management and monitoring of the storage solution attached to the host system The Global Access license enables the premium options of either version of StorView which provides full functionality and remote access e mail notifications and SNMP If a remote login is attempted from another host system on the same network and you do not have a global li...

Page 37: ... Also the notice displayed under the Other Servers section is now removed and any remotely discovered StorView Servers are displayed E mail Configuring E mail notices With a Global license installed StorView lets you up to ten e mail addresses where notices of events can be automatically sent Event Type icons These icons are displayed in the E MAIL setup They indicate the type of events that can b...

Page 38: ...crollable window provided 4 Enter the user s e mail addresses You can add as many as ten 10 e mail addresses Type the full e mail address then click one or more of the check boxes for the type of events you want the user to be notified about The types of events include Informational Warning or Error If you have more than five e mail recipients click the 6 10 button to access the next five address ...

Page 39: ...Configuring SNMP traps You can configure StorView to send SNMP traps to any network management system These traps carry all the information that appears in the log entries for each level of severity All SNMP traps sent from StorView are received by the host SNMP servers designated in the SETTINGS window for the specified port and community To configure SNMP traps 1 From the Main window click on th...

Page 40: ... and Error For more information see Event Logs on page 115 7 Click the APPLY button 8 To test the configurations click the TEST button A message tells you that the test was successfully completed and each addressee receives a test message Click the CLOSE button 9 Click the CLOSE button on the SETTINGS window Deleting an SNMP Server To delete an SNMP server 1 From the Main window click SETTINGS The...

Page 41: ... changes were successful 6 Click CLOSE to close the message Important If you lose or misplace your password contact Customer Care for further instructions 7 Click CLOSE in the SETTINGS window to exit Monitoring settings Important The Monitoring Settings are disabled with the Remote license you must upgrade to a Global license to enable these features The following options let network administrator...

Page 42: ... different subnet to be included in the receipt of StorView server packets enter the IP addresses of those other StorView servers You can add up to 10 additional monitored servers To specify additional StorView servers 1 From the Main window click SETTINGS The SETTINGS window opens 2 Click the PREFERENCES tab at the top of the window 3 Enterthe IPaddress in the IndividuallyMonitoredServers fieldof...

Page 43: ...e skip to step 5 5 Click APPLY 6 Click CLOSE on the SETTINGS window to exit Remove a monitored StorView Server IP To remove a monitored server 1 From the Main window click SETTINGS The SETTINGS window opens 2 Click the PREFERENCES tab 3 Select the IP Address you want to delete then click REMOVE 4 Click APPLY 5 Click CLOSE on the SETTINGS window to exit ...

Page 44: ...CHAPTER 3 Getting Started www gateway com 38 ...

Page 45: ...CHAPTER 4 39 Configuringyourstoragesolution Using the Storage Assistant Manually configuring a storage solution ...

Page 46: ...ge Assistant opens 2 On the Introduction window enter a name for the Configuration then click NEXT Important You can click PREVIOUS to move back one window and make any necessary changes The name is used to identify this storage solution You can use up to 64 characters although only the first 25 characters are displayed 3 Select a host server connection for this storage solution from the list of d...

Page 47: ...al logical drive After you have selected a specific drive type and created the logical drive s with those disks click PREVIOUS to create another logical drive using the drive type not yet selected Or you can alternate back and forth between selecting a disk type and creating logical drive s 4 Enter a name for the logical drive or use the default name 5 Enter the capacity for the logical drive GBs ...

Page 48: ...the window 7 Repeat Step 3 Step 6 for each additional logical drive you want to create and assign to a server If you decide that you do not want a logical drive you have added you can remove it from the list by clicking REMOVE next to the logical drive name in the summary pane If you have used up all the available capacity the fields gray out and the available capacity displays 0 GB in red Click N...

Page 49: ...sistant begins configuring the storage solution This completes the automatic configuration of your storage solution Before you bring the storage system online and into service we recommend that you make a backup copy of the configuration See Saving the configuration on page 58 ...

Page 50: ...Level Minimum No of Drives Maximum No of Drives 0 1 12 1 2 12 5 3 12 10 4 12 50 6 12 Term Description Array A group of disk drives that are combined together to create a single large storage area As many as 64 arrays aresupported each containing as many as 16 drives per array There is nocapacity limit for the arrays Back off Percent In order to let drives from a different family or manufacturer be...

Page 51: ...drives are used in every operation RAID 0 allows for single threaded I O only only one I O operation at a time Environments with many small simultaneous transactions such as order entry systems do not get the best possible throughput RAID Level 1 RAID 1 is defined as disk mirroring where one drive is an exact copy of the other RAID 1 is useful for building a fault tolerant system or data volume an...

Page 52: ...rdless of whether the drives are in multiple enclosures No changes are made to the configuration until the current process is saved so you can quit at any time without affecting the current configuration After making changes to your configuration make sure that you create a new backup copy of the configuration file For more information see Saving the configuration on page 58 Making a backup copy o...

Page 53: ...e are based on the number of drives selected For more information see RAID levels on page 44 5 If you are creating a RAID 50 arrays also create the sub arrays From the pull down menu select the number of sub arrays you want to create for this array then click CREATE A message tells you if you select more sub arrays than allowed for the number of drives chosen Reduce the number of sub arrays Import...

Page 54: ...ent drives of greater capacity sizes to be used 9 Set the Read Ahead Cache threshold The choices are automatic disabled and four pre determined sizes 256 KB 512 KB 1 MB and 2 MB Selecting Automatic default recommended lets the controller determine the optimum size Selecting Disabled turns off the read ahead cache Select from one of the pre determined sizes to optimize the read performance based on...

Page 55: ...formance 11 Click CREATE to complete this process A confirmation message tells you that the array was successfully created 12 Click CLOSE to close the message then click CLOSE at the bottom of the Create Array window to return to the Main window and monitor the initialization During initialization a progress bar appears under the array name and the disk drives in the enclosure front view display a...

Page 56: ...the write operation has completed Normally write intensive operations benefit from the higher performance when writeback cache is enabled on that array Read intensive operations such as a streaming server may not benefit from writeback cache Initializing the array Initializing an array clears all the data from the drives This ensures the validity of the data and parity stored on the array drives T...

Page 57: ...om the Main window you can monitor the initialization Mousing over the progress bar shows the percent complete for the initialization progress The drive member icons of this array change to animated icons indicating the array is initializing You can stop the initialization process by clicking the STOP link to the right of the progress bar Pausing and resuming the initialization You can temporarily...

Page 58: ...ised of either SATA or SAS drive types must have a dedicated spare of like type assigned Global spares are not assigned to a specific array and when created they can be used by any array as the replacement drive as long as the size is equal to or greater than the drive being replaced and the types are the same A dedicated spare is assigned to a specific array and it can only be used by that array ...

Page 59: ...LOSE to close the message then click CLOSE to close the DRIVE window Assigning a dedicated spare To assign a dedicated spare 1 From the Main window within the enclosure front view click the icon of an Available drive that you want to make a dedicated hot spare The DRIVE window opens Important There must be at least one drive online and available to be assigned as a hot spare and a configuration mu...

Page 60: ...ive both array 0 and array 1 are displayed because the 40 GB spare is larger than any drive in either array 3 Select the array to which you want to assign the dedicated spare from the list then click CREATE A confirmation message tells you that the process was successful 4 Click CLOSE to close the message then click CLOSE to close the DRIVE window Removing a spare This operation removes the design...

Page 61: ... drive hot spare assigned to the SAS drive array and one SATA drive hot spare assigned to the SATA drive array This enables the hot spare feature to work correctly and to have complete fault tolerance Auto spare The Auto Spare option when enabled automatically causes a replacement disk drive when inserted to be used as a dedicated hot spare for the failed drive and its array When a new drive is in...

Page 62: ...or more logical drives During the creation process you assign a LUN to the logical drive to present the logical drive to the host operating system The RAID controller supports as many as 512 logical drives A logical drive is defined or created from regions of an array a whole array or a combination of regions from different arrays that can be made available as a single disk to one or more host sys...

Page 63: ... for this logical drive If you are creating a logical drive greater than 2 198 GB 2 TB see your operating and file system documentation to make sure that they support such sizes 5 Select the LUN number for the logical drive from the Mapped to list 6 Under Availability select the Controller Ports you want to make the logical drive available through Important If you intend to perform a SAN LUN mappi...

Page 64: ...e can be important if a configuration should become corrupt or damaged You can use the file to reload the settings and re establish your storage system Otherwise you would be required to rely on your memory or notes that you may have taken when you set up the system which may not be complete Caution If you cannot restore the configuration exactly as it was you cannot restore access to the data and...

Page 65: ...ation The Save Configuration Operation window opens 3 Click DOWNLOAD to continue with saving the configuration to a file The browser s File Download window opens 4 Click SAVE to continue The Save As window opens 5 If you want to use the default file name select the directory then click Save OR ...

Page 66: ...age solution www gateway com 60 Enter the name you want to use select the directory then click Save After a successful download a confirmation message tells you the operation was successful 6 Click CLOSE to close the message and exit ...

Page 67: ...CHAPTER 5 61 SANLUNMapping Overview Terminology Accessing SAN LUN mapping Overview of the SAN LUN mapping window Creating a SAN LUN mapping Deleting a SAN LUN mapping Modifying a SAN LUN mapping ...

Page 68: ...e current mapping s and its parameters Term Description Node name This is an eight byte 16 character hexadecimal number uniquely identifying a single fibre device It incorporates the world wide Name and two additional bytes which are used to specify the format In a host system with multiple FC ports all adapters typically use the same node name but unique port names HBA port name port name This is...

Page 69: ...tion you can find information related to the host port or HBA Initiator ID selected When you select an HBA Ports name item you are shown the LUN logical unit number assigned to the logical drive read writepermissions the controller port for theconnection and logicaldrive s name ...

Page 70: ...port name The second section displayed on the right side of the window is for adding modifying and deleting SAN LUN mappings HBA Ports Name section This section provides a list of the discovered named and unnamed fibre channel HBA Ports You must select a port and identify it in the Name Host section on the right side of the window to perform the mapping After you identify the port it is helpful to...

Page 71: ...t to the connector at the rear of the enclosure This enables you to see the physical topology while performing the mapping which is helpful to fully implement the supported topology you selected during the hardware configuration and setup In an Active Active configuration you might setup a fail over mapping where one Host HBA Port is connected to the Host 0 port on the controller and the other Hos...

Page 72: ...but know that allHost HBAsmapped to thislogicaldrive see and have access to this logical drive a In the ADD NEW MAP section select the logical drive to which you want map from the list of logical drives Default logical drive names are LD1 LD2 LD3 and so on b In the same section select the LUN from the list Important Microsoft Windows does not support Read Only permissions c Select an access permis...

Page 73: ...the mappings 1 From the Main window click SAN Mapping in the Configuration tool bar The SAN LUN MAPPING window opens 2 Select the Host HBA port or the user name that you gave the port that contains the mapping you want to delete in the HBA Ports Name section 3 Select the mapping you want to delete in the MAPPINGS section click REMOVE MAPPING then click APPLY If there are multiple mappings for this...

Page 74: ...irmation message click OK to continue or click CANCEL to exit and return to the SAN LUN Mapping window 5 Add a new mapping See your notes from the existing mapping to help create the new mapping You want to recreate the mapping using new settings such as a different logical drive a new LUN different permissions or different controller host ports For specific details see Creating a SAN LUN mapping ...

Page 75: ...Modifying a SAN LUN mapping www gateway com 69 7 When you see the confirmation message click OK to continue or click CANCEL to exit and return to the SAN LUN Mapping window 8 Click CLOSE to exit ...

Page 76: ...CHAPTER 5 SAN LUN Mapping www gateway com 70 ...

Page 77: ...CHAPTER 6 71 ControllerInformation Controller environmentals Controller advanced settings ...

Page 78: ...Controller environmentals To view controller environmental conditions and manage controller environmental functions Click the Controller icon located above the Configuration tool bar on the Main window When the CONTROLLERwindow opens the controller s status is displayed using status icons and a text message The Controller icon on the Main window flashes red when a problem exists with the controlle...

Page 79: ... item in the group along with a text message Status icon and text message conditions are normal green warning yellow and failed red Hardware firmware This group of items is specific to the controller s physical memory and firmware From this group you can determine the type of processor and onboard memory size the firmware version and the CPLD Complex Programmable Logic Device firmware version You ...

Page 80: ...s If one controller has a later version of firmware than its partner controller during the startup process the later version firmware controller automatically updates the firmware on the lower version controller When you replace a failed controller the new controller is updated to match the surviving controller s firmware even if the surviving controller s firmware is older than the new controller...

Page 81: ...ess An acknowledgement window appears indicating the status of the update When the update is complete the controller restarts Controller advanced settings Overview In the Controller Information window you can view the status of the controller and perform certain controller operational functions Because your storage solution may be unique you may want to make changes to the controller parameters to...

Page 82: ... This is the name you assignto the configuration The configuration contains all the information that defines the disk arrays logical drives SAN LUN mapping hot spare drives and controller specific settings If you want to change the configuration name enter the new name in the block provided Click the APPLY button followed by the CLOSE button Configuration WWN This is the controller s WWN reported ...

Page 83: ...controller LUN is automatically assigned the next LUN number after the last logical drive Ifyour operating system is having a problem displaying the controller LUN click the pull down selection and select Disabled Different Node Name Selecting this option lets the controller report a different Configuration WWN for Port 0 and Port 1 Host 0 and Host 1 or H0 and H1 connectors on the controllers Norm...

Page 84: ...e is not available Auto Update Drive Firmware Selecting this option automatically updates the disk drive firmware when a drive has been updated using the VT 100 menu based system Any time a matching drive identical to the drive you updated in the system is discovered it automatically updates the firmware on that drive StorView displaysanicon that indicates thefirmwareis being updated in the enclos...

Page 85: ...h controller s port 1 It can range from a Soft address to 0 125 The default is ID 5 Controller Port Data Rate Use the Automatic setting for most configurations If you choose to use a specific setting 1 Gb 2 Gb or 4 Gb and override the automatic setting make sure that the software setting here matches the hardware switch setting on the HBA ports Important When using an Active Active configuration d...

Page 86: ...CHAPTER 6 Controller Information www gateway com 80 ...

Page 87: ...CHAPTER 7 81 ManagingtheStorageSolution Advanced array functions Restoring and clearing the configuration Advanced drive options Advanced logical drive functions ...

Page 88: ... Make sure that you back up the data before proceeding To delete an array 1 Stop all host I O operations 2 From the Main window click the array name you want to delete in the Arrays section The ARRAY window opens 3 Click DELETE ARRAY A confirmation window opens 4 Enter your password then click GO If the wrong password is entered you are prompted to enter the correct password and the array is not b...

Page 89: ...he Arrays section The ARRAY window opens Important If the array was trusted or never initialized you can initialize the array from this window by clicking the INITIALIZE button Arrays can also be re initialized If an array has been initialized the button name changes to Re Initialize 2 Type a new name for the array in the Name field then click APPLY Verifying parity You should perform a parity che...

Page 90: ...torage Solution www gateway com 84 To verify parity 1 From the Main window click the array name you want in the Arrays section The ARRAY window opens 2 From the ARRAY window click VERIFY PARITY A Verify Parity dialog box opens ...

Page 91: ... the Stop link located to the right of the progress bar Option Description Check Parity This option reads all the data and parity calculates the XOR of the data and compares it to the parity If there is an error it is displayed in the event log Rewrite Parity This option reads all the data calculates the XOR of the data and writes this out as the new parity This is the fastest method to complete b...

Page 92: ...d from the drives of the array You can also identify specific drives in an array by flashing its Drive Status LED For more information see Locating a drive on page 94 Rebuilding an array Important Only one rebuild can take place at a time If a rebuild is currently underway the second array scheduled for rebuild is on hold until the first array has completed the rebuild This option is designed for ...

Page 93: ...ame critical from the removed or failed drive A message tells you the process was successful 4 Click CLOSE to close the window 5 Click CLOSE on the DRIVE window You can monitor the rebuild operation from the Main window Expanding an array Caution You must stop all host I O operations prior to expanding an array You can use the Expand Array feature to increase the capacity of an existing array You ...

Page 94: ... commences bringing the non fault tolerant expanded array back to a fault tolerant condition If a second drive failure occurs during expansion that condition is not recoverable and you have a total loss of data You may want to consider backing up the data prior to expanding an array Although there is a level of protection during this operation the best insurance is a valid backup Important If you ...

Page 95: ... create an array you can trust the array This option should only be used in environments if you fully understand the consequences of the function The trust array option gives immediate access to an array for testing application purposes only A trusted array does not calculate parity across all drives so there is no known state on the drives As data is received from the host parity is calculated as...

Page 96: ...king the list and selecting from the available values 4 Enter the desired Chunk Size by clicking the list and choosing from the available values 5 At Item 6 open the list and select Trust 6 Select the Back off Percent reserved capacity for the drives by clicking the list and choosing from the available values The default is 1 7 Set the Read Ahead Cache threshold by clicking the list and choosing f...

Page 97: ...h new parity That indicates a significant change in the configuration because the failed drive member has been removed a new drive has taken its place and the hot spare is now an array member Restoring a configuration with a missing drive causes the existing data to be lost Therefore you should save the configuration with a new file name when the configuration changes See Saving the configuration ...

Page 98: ...h RAID 5 50 array Perform a Verify Parity operation see Verifying parity on page 83 before using those arrays This ensures that the data and parity data are correct Clearing the configuration You may need to clear the entire configuration This process removes all arrays logical drives SAN LUN mappings and so on If there is any data on the drives access to that data is lost when the configuration i...

Page 99: ...O A message tells you that the operation was successful 4 Click CLOSE to exit Notification To make sure that you know of changes to the configuration you can set up an e mail account that sends you a message when an event of this type occurs This may serve as a notification that you should save the configuration file again For more information see Configuring E mail notices on page 31 ...

Page 100: ...rom the DRIVE window you can you locate a drive and execute a rebuild operation Accessing the DRIVE window To access the DRIVE window From the Main window click any disk drive icon in the enclosure front view The Drive window opens Locating a drive To locate a drive 1 From the Main window identify the drive displayed in the enclosure front view then click that drive icon The DRIVE window opens ...

Page 101: ...ive functions Viewing unassigned free space Before you create or expand a logical drive you may want to examine the unassigned free space This helps you identify the available free space that you can use to create and expand logical drives The CREATE LOGICAL DRIVE window displays all available unused space or free regions To view unassigned free space 1 From the Main window Configuration tool bar ...

Page 102: ... The LOGICAL DRIVE window opens 3 Locate the Expand section of the window lower half and follow the sequenced steps beginning at Step 1 where you choose a free space region to be used for the expansion 4 In the Add Capacity box enter the amount of the selected region you want to use to expand the logical drive You can use the entire free region space or a portion of it by entering the number of GB...

Page 103: ... SAN LUN mapping if used and operating system needs because the drive is missing To delete a logical drive 1 Stop all host I O operations 2 From the Main window in the Logical Drives list click on a logical drive that you want to delete The LOGICAL DRIVE window opens 3 In the Logical Drive section click DELETE You are prompted to enter your password to confirm the expansion 4 Enter your password t...

Page 104: ...CHAPTER 7 Managing the Storage Solution www gateway com 98 ...

Page 105: ...CHAPTER 8 99 Failover Performance andAdditionalFunctions How StorView server failover works StorView performance optimization Additional StorView functions ...

Page 106: ...monitoring the storage solution During normal operations the StorView server s send check in packets every 10 seconds If three consecutive check in packets for a specific StorView Server are not received its devices are flagged and the StorView server attached to that storage solution with the lowest serial number or address takes control of those devices StorView performance optimization You can ...

Page 107: ... also provides the control button to update the software To use About 1 From the Main window click About located in the upper right corner of the window under the StorView logo The About window opens The license type for this installation is indicated below the version number in parenthesis 2 Click CLOSE to close the window Copyright 2006 Gateway All rights reserved StorView and the StorView logo ...

Page 108: ... the Main window of StorView on a non controlling server click the Take Control link StorView performs a scan and reloads the configuration for this system The StorView Server which previously had control now displays the message that the selected storage solution is being monitored by another StorView server This conditionalso occurs if this StorView serverfailed to send the required three consec...

Page 109: ...forces a search to re discover storage solutions in order to refresh the display and update status information To use Rescan From the Main window click RESCAN located on the far left side of the window After a few moments the Main window is re displayed with updated information ...

Page 110: ...CHAPTER 8 Failover Performance and Additional Functions www gateway com 104 ...

Page 111: ...APPENDIX A 105 TroubleshootingandSupport Troubleshooting Support and updates Updating Embedded StorView software Telephone support ...

Page 112: ...omer Care for the procedures to recover from a lost or missing password Lostcommunication with the RAID controllers Service is hung Windows Restart theStorView service Access the Control Panel and double click on Services Locate the StorView Service and click Stop After the service has stopped click Start then click RESCAN on the StorView Main window Service is hung Linux On Linux systems access t...

Page 113: ...s displayed The CGI script manager may not have released a segment of shared memory This can occur when heavy I O is happening at the same time you are accessing StorView If this occurs you need to stop and then restart the StorView Server service After switching drives or controllers from one storage solution enclosure to another one of thesolutionsreports that the storage solution is being monit...

Page 114: ... failed drive the array changes to a failed array state Re inserting the inadvertently removed drive puts the array back into a critical state Replacing the failed drive causes the array to begin a rebuild operation provided you assign it as a hot spare or if the Auto Hot Spare option was enabled the rebuild begins automatically when the new replacement drive is installed For RAID 0 arrays if you ...

Page 115: ...ure that you have the latest driver installed for your HBA Probe the SCSI enclosure to make sure that you see the solution Reboot the host and the storage system StorView displays the message Lost communication with server The server maybe down During heavy host operations or data I O the system may become too busy to complete CGI requests from the GUI in the time allocated After several updated a...

Page 116: ...CHNICAL SUPPORT window opens 2 Enter the requested information for each field The Problem field is scrollable 3 Click DOWNLOAD A message tells you to save the file on your local disk 4 Enter a name for the file then click Save The software creates a file with your user data a capture of the event log files and a capture of all configuration information Customer Carerepresentatives are able towork ...

Page 117: ...ick UPDATE The Update Embedded Storview window opens 3 Enter the name of the firmware file or click Browse and locate the file The file name is be similar to storview 3 04 0001 nb en bin 4 Enter your login password then click UPLOAD The upload proceeds After the update is complete StorView Server automatically restarts This process does not affect I O activity Copyright 2006 Gateway All rights res...

Page 118: ...hase the hardware or software from Gateway see the manufacturer s documentation and technical support resources If you have how to questions about using a program see Online Help Printed documentation The Microsoft Windows documentation The software publisher s Web site See the troubleshooting section of this chapter Have your customer ID serial number and order number available along with a detai...

Page 119: ...ndisbelievedtobeaccurate However changesaremadeperiodically These changesareincorporatedinnewerpublicationeditions Gatewaymayimproveand orchangeproductsdescribedinthispublication atany time Duetocontinuingsystemimprovements Gatewayisnotresponsibleforinaccurateinformationwhichmayappearinthismanual For thelatestproductupdates consulttheGatewayWebsiteatwww gateway com InnoeventwillGatewaybeliableford...

Page 120: ...APPENDIX A Troubleshooting and Support www gateway com 114 ...

Page 121: ...ENDIX B 115 EventLogs Overview Accessing and navigating the StorView event log Exporting the StorView event log Clearing the StorView event log Operating System event log List of events Failed Drives Codes ...

Page 122: ... icon and accessing the Operation tab From there you can export the controller logs to an external file or clear the log entries You can disable enclosure event monitoring to reduce the polling that StorView performs This increases the performance that may be necessary in certain applications This is accomplished by de selecting the Enclosure Support option in the ADVANCED SETTINGS window Disablin...

Page 123: ...ottom of the Event Log window the message Indicates event occurred while Server module was down This indicates that those events with this extra time stamp in the description are the results of a synchronization and displays the exact time the event actually occurred StorView s event log has a maximum size limited only by the available disk space so the log events in StorView requires regular main...

Page 124: ... This option only works for the host based version You can export the event logs to a comma delimited file for use in third party software products host based version of StorView only Some Web browsers provide more options for the format of the file See your browser for specific details To export the log file 1 From the Main window of the storage system you are logged into click Logs located in th...

Page 125: ... delimited format If you are using a Mozilla type Web browser you see the following window This product provides you with a few more options through the Advanced button Click Advanced and select the file format type creator application and other options 3 Click CLOSE on the Event Logs window Clearing the StorView event log You can clear the event log from this window host based version of StorView...

Page 126: ... the event type followed by its ID The ID is in hexadecimal format and itsequivalent decimal value inparentheses The event number is how the events are displayed in the operating system event log and the decimal value is the format the OS event log uses to display the event ID You can double click the specific event in the operating system log A window with a plain English description of the event...

Page 127: ...0x xx 0x xx 0x xx 0x xx 0x xx Error 0xB01 2817 Internal hardware or firmware failure Fault SDRAM or damaged internal bus Internal hardware Memory or bus error on the indicated channel Replace the controller Contact Customer Care The controller s internal temperature aa C has exceeded the maximum limit The controller shuts down to prevent damage Error 0xB03 2819 Blocked fan Failing fan Elevated amb...

Page 128: ...are failure Enclosure 5V or 12V problem in the power supply Replace the controller Replace the defective power supply Internal transfer error Error 0xB1A 2842 Hardware problem Replace the controller The discovery process has completed identifying all SAS devices on the SAS domain Information 0xB22 2850 Courtesyinformational message No action necessary A discovery process has started to determine a...

Page 129: ...troller is now functioning correctly Information 0xB42 2882 Battery charging is complete No action necessary The controller has been powered off Information 0xB50 2896 Removal of the controller or power No action necessary The controller has been powered on Information 0xB51 2897 The controller was powered on No action necessary The controller self test was successfully completed Information 0xB52...

Page 130: ...ller firmware has been upgraded to version xxxxx Information 0xB60 2912 User upgraded the controller firmware No action necessary The controller battery backup unit is charging Information 0xB62 2914 Battery charging started No action necessary Flushing of the battery protected cache has started There are xx cache entries totalling yy 512 byte blocks Information 0xB63 2915 Failure of power with wr...

Page 131: ...Drive member index has failed due to an unrecoverable error Sense Data xx xx xx Error 0xB0A 2826 Typically due to a non recoverable media error or hardware error Replace the disk drive The drive w SN SAS w WWN xx xx xx xx xx xx Slot number Drive number has been marked as failed because it was removed Error 0xB0B 2827 Drive has been removed or bypassed by the user or has a serious hardware error Re...

Page 132: ...critical state Error 0xB1B 2843 Drive removal or failure Replace the disk drive and rebuild the array The drive w SN SAS w WWN xx xx xx xx xx xx Slot number returned a bad status while completing a command SCSIInfo Operation type Status type Error 0xB27 2855 Unknown status returned by the disk drive Contact Customer Cardandprovidethem with a copy of the event log The drive w SN SAS w WWN Slot nn E...

Page 133: ...ray is already in a degraded mode The controller passes the status from the drive back to the host system to let the host recovery mechanisms be used Details HostLoop x Host Loop ID y Mapped LUN Requested z Op Code zz Sense Data uu Error 0xB40 2880 Typically due to a non recoverable media error hardware error or loop bus error No action necessary A RAID 5 50 parity check has started on Array Name ...

Page 134: ...necessary The writeback cache on Array name has been disabled Reason s see causes Warning 0xB6F 2927 Disabling of writeback cache for the indicated reasons The partner controller has failed The battery is not charged or present The array has become critical A prepare for shutdown was received by the controller Replace the failed controller Charge the backup battery or re install the battery Resolv...

Page 135: ...ent Messages Type ID Cause Action Controller Port Event Messages Type ID Cause Action Host Loop 0 1 acquired Loop ID xx because we werenot abletogetLoop ID xx as specified in the controller settings Error 0xB17 2839 0xB18 2840 Address conflict with either host adapter or other device on the same loop Resolve address conflict A LIP has occurred on Host loop xx Reason type The LIP was repeated yy ti...

Page 136: ...has reported an invalid status of 0x xx to a particular command Error 0xB38 2872 This indicates a firmware error in the host fibre channel chip Contact Customer Care A SAS command was aborted on the drive w WWN xx xx xx xx xx xx xx xx Slot num Enclosure num for the SCSI Op Code 0x xx Error 0xB39 2873 Aborted command Possible reasons are faulty disk drive fault drive slot faulty enclosure cable iss...

Page 137: ...SI command 0x02X Error 0xB79 2937 This error is generated when a command to the Enclosure processor timeouts Verify if the system has gone to SES_LEVEL_1 If it has verify the configuration Faulty cables drives or Drive I O Interface Module malfunction could be the root cause of this error You may occasionally see this error during drive insertion failover failback or drive removal As long as the s...

Page 138: ...sure temperatures have reached the threshold of 50 C Ensure that both cooling fans are operating normally Replace if needed If the fans are set to automatic speed control place the jumper on the Cooling fan module circuit board to force the fans to high speed If the environment ambient temperature is high reduce the ambient temperature Ensure that the airflow is not blocked or restricted on the en...

Page 139: ... caused the alarm to sound is continuing to remind the user Press the Alarm Mute button on the Ops panel and isolate the cause of the alarm Alarm is On Continuous Error 0xC6E 3182 Acondition causedthe alarm to sound Press the Alarm Mute button on the Ops panel and isolate the cause of the alarm SES access fault tolerant Multiple paths are available for gathering this enclosure s status information...

Page 140: ...s button Re enter the serial number and key If you still have problems contact Customer Care All event logs cleared Information 0x105 261 A user cleared the StorView event logs No action required Auser name hasupdated their password Information 0x106 262 A specific user has updated their password No action required A user name from Host host name IP Address IP_address unsuccessfully attempted to u...

Page 141: ...file start StorView then press the RESCAN button or restart the StorView service Shared memory used for the Server and the GUI to communicate could not be created nor located Error 0x301 769 StorView tried to create or locate the shared memory used for the Server and Server CGI script to communicate Quit StorView and all connections accessing this StorView Server wait 1 minute then restart them A ...

Page 142: ... a CGI request before its allowed time expired Error 0x306 774 The Server completed the request but by the time it was done the Server CGI gave up Retry request Quit StorView and all connections accessing this StorView Server wait 1 minute then restart them Restart the system The Server CGI script was unable to return CGI request results to the GUI Error 0x307 775 The Server passed the completed r...

Page 143: ...ive Timeout The drive has either timed out or been removed Re insert the disk drive Replace the disk drive Command xx Sense Key yy Ext Sense zz The drive has failed for the specified command with the indicated SCSI sense key and extended sense key Replace the disk drive ...

Page 144: ...APPENDIX B Event Logs www gateway com 138 ...

Page 145: ...APPENDIX C 139 Statistics Overview Access statistics Command size alignment statistics Read Ahead statistics Command cluster statistics ...

Page 146: ...statistics for all logical drives controllers and individual or all ports These can be used to help balance the load from the host You may also export the statistical data to a comma delimited file for use in third party software products Access statistics These statistics are for both reads and writes and can be used to tune the operating system for optimum performance Every time statistics are v...

Page 147: ...n the last few seconds from the logical drives controllers or ports This value is expressed in MB seconds Writes This is the average number of MBs transferred in the last few seconds to thelogicaldrives controllers or ports This value is expressed in MB seconds No of Operations This is the total number of read and write accesses that have occurred since these statistics were reset or the controlle...

Page 148: ...on performance To overcome these problems you can with more sophisticated operating systems set the access size and alignment to an optimal value How to Use Command Size and Alignment To calculate the alignment we check the LBA for the largest number of blocks that are evenly divided into it in powers of 2 So we can see that in this case the alignment is 0x10 16 blocks This equates to 8 K The alig...

Page 149: ...ller searches back in the command queue whenever it receives a new read command that is not satisfied by an existing read ahead cache buffer In a multi threaded operating system commands from one threadmaybeinterspersedwithcommandsfromanother thread The controller must check more than just the immediately previous command The controller searches back for a number of commands to see if the new comm...

Page 150: ...writeback cache can be used to delay the write to disk increasing the likelihood of clustering more data Read Ahead Command Hit Rate This is the percentage of read command hits versus the total number of read commands that have been issued This gives an indication of the sequential nature of the data access pattern from the host Read Ahead Command Efficiency This is the percentage of the number of...

Page 151: ...mmands it may cluster a large number of them together These statistics record the average and maximum number of commands the controller clusters and the percentage for each one of these values Command Cluster Interval Indetermining whethertoclusterwritecommandsornot the controller searches back in the command queue whenever it receives a new write command In a multi threaded operating system comma...

Page 152: ...APPENDIX C Statistics www gateway com 146 ...

Page 153: ...APPENDIX D 147 OptimizingRAID5WritePerformance Introduction Sequential access Access size RAID 5 sub array Multiple drive failures Summary ...

Page 154: ... over to the next drive This parameter is adjustable from 64 K to 256 K and should be carefully chosen to match the access sizes of the operating system A stripe is a set of disk chunks in an array with the same address In the following example Stripe 0 consists of C0 C1 C2 and C3 and their associated parity P 0 3 Maximum performance is achieved when all drives are performing multiple commands in ...

Page 155: ...stem a write of one chunk of data would reside exactly within a chunk on one disk However if this is not the case this write is split up into two separate writes to two different data drives This has a negative effect on performance To overcome these problems you can with more sophisticated operating systems set the access size and alignment to an optimal value To get the highest performance from ...

Page 156: ... the seven necessary as indicated below The array of drives appears as two separate sub arrays each with its own rotating parity You can see that the more sub arrays used the more likely it is that a full stripe write occurs and the higher the performance It is recommended to use either four orfivedrives ina sub array for best performance The following table shows that even with 15 drives it is st...

Page 157: ... in the sub array not all of the drives in the array This increases both the rebuild speed and the speed of access to missing data which also has to be recreated from the remaining drives Summary In summary for maximum performance using RAID 5 we recommend that you use four or five drives in a sub array If there are more than five drives in a sub array you should use a smaller chunk size such as 6...

Page 158: ...APPENDIX D Optimizing RAID 5 Write Performance www gateway com 152 ...

Page 159: ... 122 controller failover started 122 controller firmware upgraded 122 controller powered on 121 controller present 120 controller removed 120 controller reset 121 controller selftest failed 121 controller selftest passed 121 controller shutdown 122 controller timeout 120 controller valid 120 event log cleared 121 fatal watchdog error 119 flush cache completed 122 flush cache started 122 flush mirr...

Page 160: ... capacity 56 logical drive status icon 25 LUN number 56 M mapping name 62 mirror cache 48 missing 20 mixed drive types 23 modifying a SAN LUN mapping 67 modifying arrays 81 module tabs 27 monitoring initialization 49 N navigating the event log 115 network settings 28 new IP address 29 node name 62 notification tips for configuration changes 91 O operating system event log 118 operations access sta...

Page 161: ... power supply OK 129 SES events 129 setup for Linux 12 single controller mode 76 SMTP mail server 32 SNMP traps 33 Software version 99 software version 99 spare drives 52 starting StorView 29 static IP address 29 status environmental 71 storage solution icon 27 StorView manager console 30 StorView server events 132 StorView server icon 26 stripe 46 stripe size 46 sub array 46 system requirements R...

Page 162: ...Index www gateway com 156 ...

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