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HP StorageWorks MSA 2/8 - SAN Switch, Installation Manual

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HP StorageWorks MSA 2/8 - SAN Switch Installation Manual Download Page 51

51

MSA SAN Switch 2/8 Installation Guide

5

Backing Up Configuration Data 

and Upgrading Firmware

This chapter discusses the following topics:

■

Backing Up System Configuration Settings

, page 52

■

Restoring System Configuration Settings

, page 53

■

Upgrading or Restoring the Switch Firmware

, page 54

Summary of Contents for StorageWorks MSA 2/8 - SAN Switch

Page 1: ...0 First Edition December 2002 Part Number 308999 001 The HP StorageWorks MSA SAN Switch 2 8 is a high performance 2 Gb s 8 port Fibre Channel switch used to connect the Modular SAN Array 1000 storage device to hosts and Enterprise Backup Solutions in a Storage Area Network ...

Page 2: ...ithout notice Compaq Computer Corporation is a wholly owned subsidiary of Hewlett Packard Company Microsoft MS DOS Windows Windows 2000 and Windows NT are registered trademarks of Microsoft Corporation in the U S and or other countries Java is a registered trademark of Sun Microsystems Inc The Open Group UNIX are trademarks of The Open Group in the U S and or other countries Hewlett Packard Compan...

Page 3: ...horized Reseller 12 1 About the MSA SAN Switch 2 8 13 MSA SAN Switch 2 8 Firmware Features 15 MSA SAN Switch 2 8 Hardware Features 16 MSA SAN Switch 2 8 Panel Description 17 LEDs 18 Optical Ports 18 Ethernet Port 19 Serial Port 19 2 Installing the MSA SAN Switch 2 8 21 Verifying Carton Contents 22 Installing the MSA SAN Switch 2 8 in the MSA1000 23 Installing an SFP Module 27 3 Configuring the MSA...

Page 4: ...ptional Feature Licenses 44 Enabling Licensed Features 44 LED Activity Definitions 45 Switch Readiness LED Definitions 46 Port Speed LED Definitions 46 Port Status LED Definitions 47 MSA SAN Switch 2 8 POST and Diagnostic Tests 48 POST Results 48 Disabling POST 48 Diagnostic Tests 49 5 Backing Up Configuration Data and Upgrading Firmware 51 Backing Up System Configuration Settings 52 Restoring Sys...

Page 5: ...60 Modifications 60 Network and Serial Cables 60 Canadian Notice Avis Canadien 60 Class A Equipment 60 European Union Notice 61 China Taiwan Notice 61 Japanese Notice 62 Laser Devices 63 Laser Safety Warnings 63 Compliance with CDRH Regulations 63 Compliance with International Regulations 63 Laser Product Label 64 Laser Information 64 B Electrostatic Discharge 65 Grounding Methods 66 C I O Connect...

Page 6: ...g panel 26 7 Installing an SFP 27 8 CLI initial menu 39 9 Initial Web Tools display 41 10 LED locations on the MSA SAN Switch 2 8 45 11 Web Tools initial Fabric View menu 56 12 Firmware Upgrade tab 58 Tables 1 Document Conventions 9 2 System Assigned Switch Names 14 3 Serial Port Settings 32 4 Switch Readiness LED Definitions 46 5 Port Speed LED Definitions 46 6 Port Status LEDs 47 7 Laser Specifi...

Page 7: ... this Guide About this Guide This installation guide provides information to help you install configure and manage the HP StorageWorks MSA SAN Switch 2 8 About this Guide topics include Overview page 8 Conventions page 9 Rack Stability page 11 Getting Help page 12 ...

Page 8: ...al supporting documents for this switch The following documents are available on both the HP StorageWorks SAN Switch Documentation CD included in the shipping carton with the switch and the HP website HP StorageWorks Fabric OS Procedures User Guide HP StorageWorks Fabric OS Reference Guide HP StorageWorks Web Tools User Guide HP StorageWorks ISL Trunking User Guide HP StorageWorks Zoning User Guid...

Page 9: ... this manner indicates that failure to follow directions in the warning could result in bodily harm or death Table 1 Document Conventions Element Convention Cross reference links Figure 1 Key and field names menu items buttons and dialog box titles Bold File names application names and text emphasis Italics User input command and directory names and system responses output and messages Monospace f...

Page 10: ...esence of electrical shock hazards Enclosed area contains no operator serviceable parts WARNING To reduce the risk of personal 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 telecommunication...

Page 11: ... reduce the risk of personal injury or damage to the equipment observe local occupational health and safety requirements and guidelines for manually handling material Rack Stability Rack stability protects personal and equipment WARNING To reduce the risk of personal injury or damage to the equipment be sure that The leveling jacks are extended to the floor The full weight of the rack rests on the...

Page 12: ... under support at http www hp com Be sure to have the following information available before calling Technical support registration number if applicable Product model names numbers and serial numbers Exact text of any applicable error messages Operating system type and revision level Detailed specific questions HP Storage Website The HP website has the latest information on this product as well as...

Page 13: ...ckup Solutions in a Storage Area Network SAN The MSA1000 provides two slots for embedded interconnect devices The MSA1000 ships standard with one Fibre Channel I O Module in the primary slot and a blanking panel in the secondary slot Available embedded interconnect options include the provided Fibre Channel I O Module an MSA HUB 2 3 and this MSA SAN Switch If a redundant configuration is needed tw...

Page 14: ...SA SAN Switch 2 8 Firmware Features MSA SAN Switch 2 8 Hardware Features MSA SAN Switch 2 8 Panel Description Table 2 System Assigned Switch Names MSA1000 Sot Location Switch Name Primary rear left MSA1000 Controller Name switch1 Secondary rear right MSA1000 Controller Name switch2 Note The first portion of the switch name is the name assigned to the MSA1000 Controller installed in the associated ...

Page 15: ...covery that discovers and registers host server and storage devices Zoning functionality that provides a means to allocate storage controllers to groups of computers Zoning allows you to create logical subsets of the fabric to accommodate closed user groups or to create functional user groups within a fabric For more information refer to the HP StorageWorks Zoning User Guide This guide is included...

Page 16: ...pport the redundant MSA1000 controllers Single chip ASIC switch design Eight ports Seven available 2 Gb s Fibre Channel ports are compatible with Small Form Factor Pluggable SFPs transceiver interconnects Port 1 through Port 7 One internal port Port 0 for interfacing with the MSA1000 Array Controller using F_Port protocol Per port automatic negotiation to the highest possible speed One IEEE compli...

Page 17: ...e MSA SAN Switch The switch panel houses the seven available fiber optic ports the Ethernet port the serial port and the corresponding LEDs Figure 2 MSA SAN Switch 2 8 Item Description 1 Latch 2 Switch readiness LED 3 Optical ports 7 4 Port status LED 5 Port speed LED 6 10 100 Ethernet port RJ 45 7 Serial port DB 9 8 Handle 2 3 4 5 6 7 8 1 ...

Page 18: ...the devices connected to that port These ports conform to the American National Standards Institute ANSI Fibre Channel FC PI specification for Fibre Channel SFP transceivers The optical ports are numbered from left to right and are color coded into two groups indicating which ports can be used in the same ISL Trunking group ISL trunking is an optional feature that enables distribution of traffic o...

Page 19: ...s the Web Tools graphical user interface By default the switch is configured to use an IP address of 10 77 77 77 See Configuring the MSA SAN Switch 2 8 for information on setting the IP address Serial Port This connector is provided for switch configuration and management You can access the CLI through a terminal or terminal emulator connected to this port The MSA SAN Switch is designed to functio...

Page 20: ...About the MSA SAN Switch 2 8 20 MSA SAN Switch 2 8 Installation Guide ...

Page 21: ... Installation Guide 2 Installing the MSA SAN Switch 2 8 This chapter discusses the following topics Verifying Carton Contents page 22 Installing the MSA SAN Switch 2 8 in the MSA1000 page 23 Installing an SFP Module page 27 ...

Page 22: ... 3 and listed in the supporting table Note If any items are damaged or missing contact HP or an HP Authorized reseller Figure 3 Carton contents Item Description 1 MSA SAN Switch 2 8 product accessory bag containing Printed HP StorageWorks MSA SAN Switch 2 8 Installation Guide Documentation CD License agreement Warranty Information 2 HP StorageWorks MSA SAN Switch 2 8 3 RS 232 serial cable straight...

Page 23: ...static Discharge appendix for more information Note The MSA SAN Switch is a hot pluggable component of the MSA1000 and can be installed and uninstalled regardless of whether the MSA1000 is powered on Caution Depending on the operating systems of the servers already attached to the MSA1000 and the applications they are running verify that they can tolerate a temporary disruption while the MSA SAN S...

Page 24: ...he I O module slide and hold the latch on the I O Module to the right and then grasp the handle and pull the I O Module straight out of the bay See Figure 4 for an illustration Figure 4 Removing the Fibre Channel I O Module Note Carefully remove and save the SFP from the Fibre Channel I O Module it can be re used in the MSA SAN Switch See Installing an SFP Module for information on handling SFPs 2...

Page 25: ...ector into the bay until the connector seats and the latch clicks See Figure 5 for an illustration Figure 5 Inserting the MSA SAN Switch 2 8 into the vacant slot If the MSA1000 is powered on the MSA SAN Switch is powered on as soon as it is installed The switch begins running a Power on Self test POST a system diagnostic that requires approximately seven minutes to complete See Interpreting POST R...

Page 26: ...l in place and remove the blank from the back of the unit See Figure 6 for an illustration of removing the blanking panel Figure 6 Removing the blanking panel Save the blanking panel for re use in the event the redundant switch is ever removed Either an embedded device or the blanking panel must always be in place for proper airflow and cooling Note Do not connect the switch to the network until t...

Page 27: ...FP into the port until it is firmly seated and the latching mechanism clicks Note The SFP is keyed so that it can only be inserted with the correct orientation into the port If the SFP does not slide in easily check the orientation See Figure 7 for an illustration of the fiber cable the SFP module and tab and the optical port Figure 7 Installing an SFP Note To remove an SFP from an optical port ca...

Page 28: ...switch to a configured SAN without first configuring the switch 4 Connect the cables to the SFPs as appropriate to the fabric topology by positioning each cable so that the key the ridge on one side of the cable connector is aligned with the slot in the SFP Insert the cable into the SFP until it is firmly seated and the latching mechanism clicks 5 Proceed to the following chapter in this guide to ...

Page 29: ...he IP address must initially be entered using the CLI After the IP address is set additional parameters must be entered but they may be entered through either the CLI or the Web Tools This chapter discusses Requirements page 30 Entering Initial Configuration Settings through the CLI page 31 Connecting the MSA SAN Switch 2 8 to the Ethernet Network page 35 Completing MSA SAN Switch 2 8 Configuratio...

Page 30: ...g the switch to the workstation This cable must be a straight through cable A local workstation desktop or notebook computer with a serial terminal connection RS 232 serial communication software for example ProComm Plus or HyperTerminal Ethernet cable for connecting the switch to the workstation or to a network containing the workstation This cable can be a cross over cable or a straight through ...

Page 31: ...structions for accessing the CLI through each of these methods is detailed in the following paragraphs Accessing the CLI through the Serial Port When using the serial port to access the switch you must first configure the serial port settings 1 Verify that the installed switch has power and POST has completed See Interpreting POST Results for more information 2 Remove the shipping plug from the MS...

Page 32: ...s Enter several times to display the login prompt 7 At the login prompt enter the user ID For example login admin The password prompt is displayed 8 Enter the password for the user password xxxxxx The default password is password Note For security reasons the first time you log into the CLI you are requested to change the admin user ID and system password 9 If the login was successful a prompt is ...

Page 33: ...utomatically sense the cable configuration used straight or cross over 4 From your workstation open a telnet session to the MSA SAN Switch To open a telnet session through the command prompt enter TELNET 10 77 77 77 The login prompt is displayed 5 At the login prompt enter the user ID For example login admin The password prompt is displayed 6 Enter the password for the user password xxxxxx The def...

Page 34: ...t the prompt ipAddrSet 3 Enter the information at the prompts as listed below Note Press Enter to pass over a prompt and accept the default value Ethernet IP Address 10 77 77 77 Enter the new ethernet IP address Ethernet subnetmask 255 255 255 0 Enter the new ethernet subnetmask Fibre Channel IP Address none Enter the new Fibre Channel IP address if desired Fibre Channel subnetmask none Enter the ...

Page 35: ...through the Ethernet Use the following CLI command to verify the switch connection PING ipaddress where ipaddress is the Ethernet IP address of the MSA SAN Switch For example PING 10 77 77 77 Reply from 10 77 77 77 bytes 32 time 10ms TTL Reply from 10 77 77 77 bytes 32 time 10ms TTL Reply from 10 77 77 77 bytes 32 time 10ms TTL Reply from 10 77 77 77 bytes 32 time 10ms TTL Ping statistics for 10 7...

Page 36: ...hapter These remaining configuration tasks are performed in either of the following user interfaces Command Line Interface CLI Web Tools Each of these user interfaces is briefly discussed in Managing the MSA SAN Switch 2 8 and is discussed in detail in separate user guides The user guides for the CLI and Web Tools are available on the documentation CD included in the shipping carton with the switc...

Page 37: ... SAN Switch 2 8 This chapter discusses the following management topics Command Line Interface CLI Overview page 39 Web Tools Overview page 40 Optional Management Tools page 42 LED Activity Definitions page 45 MSA SAN Switch 2 8 POST and Diagnostic Tests page 48 ...

Page 38: ...er to the HP StorageWorks Fabric OS Procedures Guide and the HP StorageWorks Fabric OS Reference Guide These guides are included on the documentation CD included in the shipping carton Web Tools via an Ethernet connection provides an easy to use graphical user interface allowing the SAN administrator to monitor and manage entire fabrics and individual switches and ports from any standard workstati...

Page 39: ...terface can be used to complete the switch configuration and perform maintenance tasks All MSA1000 supported operating systems can use the CLI to manage their switch Figure 8 CLI initial menu For details on using the CLI to manage your MSA SAN Switch refer to the HP StorageWorks Fabric OS Procedures Guide and the HP StorageWorks Fabric OS Reference Guide These manuals are available on the document...

Page 40: ...emotely Note Web Tools can be run from any workstation that supports a Java Runtime Environment version JRE 1 2 008 or later The Java Plug in can be loaded from the documentation CD included in the shipping carton with the switch The plug in is loaded in the Firmware subdirectory Double click on the JAVAPLUGIN EXE file to begin the installation procedure Note Before the switch can be used or can b...

Page 41: ... a Web Tools license can be managed through the Web Tools GUI Note The switch panel image in the documentation is a representation of the switch The switch panel on your screen display will accurately represent your switch For instructions using Web Tools to manage your MSA SAN Switch and on installing the Java Plug in refer to the HP StorageWorks Web Tools User Guide This manual is available on t...

Page 42: ...ler Note Some licenses may have been installed on the switch at the factory HP recommends recording all software keys in case they are deleted by accident See Displaying the Optional Feature Licenses ISL Trunking The optional ISL trunking feature enhances switch to switch performance in a SAN while simplifying management tasks and improving reliability Advantages to integrating ISL Trunking into y...

Page 43: ...optional Fabric Watch feature allows you to monitor the performance and status of Fibre Channel SAN Switches Advantages to integrating Fabric Watch into your SAN include Real time alerts to potential problems within the SAN Monitoring of fabric events like reconfiguration and zone changes physical switch conditions and individual port status For more information refer to the HP StorageWorks Fabric...

Page 44: ...Displaying the Optional Feature Licenses Use these steps to display optional features installed on your switch 1 Log on to the switch as the admin user 2 At the command line enter licenseShow This command displays the license keys that have been entered for the switch and the features enabled by those licenses Enabling Licensed Features All optional licensed features must be enabled with a license...

Page 45: ...ng These patterns are normal and do not indicate a problem Wait until POST or other diagnostic tests are completed before examining and interpreting the LEDs Note Any errors related to LED activity are listed in the error log For information about the error log refer to the HP StorageWorks Fabric OS Procedures Guide The MSA SAN Switch panel and its associated LEDs are illustrated in Figure 10 Figu...

Page 46: ... ports are offline OR Switch is booting and has not logged into the MSA1000 Verify the switch has completed booting and is not disabled If light is still yellow check the error log and the Port Status LEDs Slow flashing yellow on 1 second off 1 second Error log contains one or more port diagnostic error messages Check error log port status LEDs port media and cables or loopback plugs Table 5 Port ...

Page 47: ...to the port Fast flashing green on 1 4 second off 1 4 second Port is in internal loopback diagnostic No action required Flickering green Port is online No action required Steady amber Port is receiving signal carrier but is not yet online No action required Slow flashing amber on 1 second Off 1 second Port is disabled result of diagnostics or portDisable command Enable port can use PortEnable comm...

Page 48: ...mpleted without errors verify that all LEDs return to a normal state after POST is complete If one or more LEDs do not return to a normal state or if the CLI switch prompt does not display when POST completes POST was unsuccessful Check the success fail results of the diagnostic tests run during POST via LED activity the error log or the CLI using the errShow command For more information about err...

Page 49: ...d media and any SFP modules and fiber optic cables in use The tests are implemented by command either through a telnet session or a serial connection All diagnostic tests are run at link speeds of both 1 Gbps and 2 Gbps For information about the specific diagnostic tests and how to run them refer to the HP StorageWorks Fabric OS Procedures User Guide Note The transmit and receive speed of the link...

Page 50: ...Managing the MSA SAN Switch 2 8 50 MSA SAN Switch 2 8 Installation Guide ...

Page 51: ...Backing Up Configuration Data and Upgrading Firmware This chapter discusses the following topics Backing Up System Configuration Settings page 52 Restoring System Configuration Settings page 53 Upgrading or Restoring the Switch Firmware page 54 ...

Page 52: ...ice or the FTP service is running on the host computer 2 Log in to the switch as the admin user 3 At the command line enter CONFIGUPLOAD HOSTIPADDR USER PATH_FILENAME PASSWORD where HOSTIPADDR is the IP address of the host computer USER is the User ID used to log into this computer PATH_FILENAME is the path location and filename of the configuration file and PASSWORD is the password for the User I...

Page 53: ...r CONFIGDOWNLOAD HOSTIPADDR USER PATH_FILENANME PASSWORD where HOSTIPADDR is the IP address of the host computer USER is the User ID used to log into this computer PATH_FILENAME is the path location and filename of the configuration file and PASSWORD is the password for the User ID specified Note The password operand is required only if you are using FTP If only CONFIGDOWNLOAD is entered the syste...

Page 54: ...discussed in the following sections Note All switches in the fabric must be running the same version of the firmware If you upgrade the firmware on one switch you must upgrade all switches Downloading New Switch Firmware through the CLI Before you upgrade the firmware on your switch verify the version of the firmware you are currently using Determining Your Firmware Version through the CLI To view...

Page 55: ...R PATH_FILENAME PASSWORD where HOSTIPADDR is the IP address of the host computer USER is the User ID used to log into the switch PATH_FILENAME is the path location and filename of the configuration file and PASSWORD is the password for the User ID specified Note The password operand is required only if you are using FTP If only FIRMWAREDOWNLOAD is entered the system will prompt you for each parame...

Page 56: ... verify version of the firmware you are currently using Determining Your Firmware Version through Web Tools To view the current version of the firmware on the switch 1 Access Web Tools The Fabric View is displayed by default A panel for each switch in the fabric is displayed on the screen Figure 11 is an illustration of the Web Tools Fabric View Figure 11 Web Tools initial Fabric View menu ...

Page 57: ...load the latest version of the firmware on the switch 1 Download the firmware from the HP website at http www hp com Go to the Support page for the required loaders and instructions 2 Access Web Tools 3 Click the Admin icon button next to the switch panel display to go to the Administrative Interface At the prompt enter a user name and password with administrative privileges and click OK The Admin...

Page 58: ...de tab 5 Select the Firmware Download function 6 Modify the Host IP address to indicate the host with the firmware 7 Modify the Filename to indicate the path and filename of the firmware 8 Select the Fastboot After Download boot option 9 Select Apply Wait for the firmware download to complete and the switch to restart ...

Page 59: ...erference free radio frequency spectrum Many electronic devices including computers generate RF energy incidental to their intended function and are therefore covered by these rules These rules place computers and related peripheral devices into two classes A and B depending upon their intended installation Class A devices are those that may reasonably be expected to be installed in a business or ...

Page 60: ...ice complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Modifications The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly approved ...

Page 61: ...on of the European Community Compliance with these directives implies conformity to the following European Norms the equivalent international standards are in parenthesis EN55022 CISPR 22 Electromagnetic Interference EN50082 1 IEC801 2 IEC801 3 IEC801 4 Electromagnetic Immunity EN60950 IEC950 Product Safety Also approved under UL 1950 3rd Edition CSA C22 2 No 950 95 Safety of Information Technolog...

Page 62: ...Regulatory Compliance Notices 62 MSA SAN Switch 2 8 Installation Guide Japanese Notice ...

Page 63: ... radiation Do not try to open the laser device enclosure There are no user serviceable components inside Do not operate controls make adjustments or perform procedures to the laser device other than those specified herein Allow only HP authorized service technicians to repair the laser device Compliance with CDRH Regulations The Center for Devices and Radiological Health CDRH of the U S Food and D...

Page 64: ...he product is classified as a CLASS 1 LASER PRODUCT This label appears on a laser device installed in your product Laser Information The following table lists laser specifications Table 7 Laser Specifications Item Specification Wave length 850 nm 35 nm Divergence angle 53 5 degrees 4 5 degrees Output power Less than 2 0 mW or 10 869 Wm 2 sr 1 Polarization Circular 0 25 Numeric aperture 0 45 inches...

Page 65: ...type of damage may reduce the life expectancy of the device To prevent electrostatic damage observe the following precautions Avoid hand contact by transporting and storing products in static safe containers Keep electrostatic sensitive parts in their containers until they arrive at static free workstations Place parts on a grounded surface before removing them from their containers Avoid touching...

Page 66: ...flexible straps with a minimum of 1 megohm 10 percent resistance in the ground cords To provide proper ground wear the strap snug against the skin Use heel straps toe straps or boot straps at standing workstations Wear the straps on both feet when standing on conductive floors or dissipating floor mats Use conductive field service tools Use a portable field service kit with a folding static dissip...

Page 67: ...witch to a computer workstation to configure the switch IP address without connecting to the fabric The serial port s parameters are 9600 baud 8 data bits no parity 1 stop bit and no flow control The port requires a straight serial cable with a female 9 pin subminiature D connector Only pins 2 3 and 5 are supported as shown in Table 8 Note For dust and ESD electrostatic discharge protection a cove...

Page 68: ...ied in Table 9 Note For dust and ESD electrostatic discharge protection a cover is provided for the Ethernet port and should be kept on the port whenever the Ethernet port is not in use Table 9 Ethernet Port Cabling Pin Layout Pin Signal Function 1 TX Transmit data 2 TX Transmit data 3 RX Receive data 4 NC 5 NC 6 RX Receive data 7 NC 8 NC 9 NC ...

Page 69: ...aging by 38 overview 39 setting the IP address 34 upgrading the firmware 55 user ID and password 32 33 configuration final 36 initial 31 configuration settings backing up 52 restoring 53 connection protocols supported 15 conventions document 9 equipment symbols 10 text symbols 9 D Declaration of Conformity 60 description of switch 13 diagnostic tests 49 displaying installed feature licenses 44 doc...

Page 70: ...e website 12 technical support 12 HyperTerminal 32 I installing the switch 23 IP address default 19 setting in CLI 34 ISL Trunking 42 ISL trunking available groupings 18 described 18 L laser devices information about 63 product label 64 safety warnings 63 specifications 64 LEDs illuminations 45 locations of 45 port speed illuminations 46 port status illuminations 47 switch readiness illuminations ...

Page 71: ...ed 19 location 17 port settings 32 UNIX settings 32 Power on Self test POST 48 primary slot location of 13 protocols supported 15 Q QuickLoop 43 R rack stability warning 11 Regulatory Compliance Identification Numbers 59 related documentation 8 requirements for network addressing 30 restoring configuration settings 53 S secondary slot location of 13 serial port configuring for use 31 described 19 ...

Page 72: ...the firmware 54 user ID in the CLI 32 33 V verifying operation 36 version of firmware viewing in the CLI 54 viewing in Web Tools 56 W warning rack stability 11 symbols on equipment 10 Web Tools managing by 38 overview 40 upgrading the firmware 57 website HP storage 12 Z zoning described 15 ...

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