Dell PowerVault TL2000 Manuel utilisateur

DellPowerVault™TL4000/TL2000FailoverGuide

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1|Page12/31/09version2.0

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DellPowerVault™TL4000/TL2000FailoverConfigurationGuide

Thisdocumentdescribesthefailoverfeature,outlinesthesupportedfailoverconfigurationsfortheDell

PowerVault™TL4000andTL2000productsandprovidesinstructionsforconfiguringthelibrary,drives,

andhostserverforfailover.

PleasenotethesupportedconfigurationsarecloselyrelatedtotheLTOdrivegenerationandformfactor

installedinthetapelibrary.PleasereferDellPowerVault™supportedFailoverconfigurationmatrixtable

1and2

Contents

WhatisFailover?........................................................................................................................................... 2

DellPowerVault™TL2000/TL4000ConfigurationSupportmatrix ............................................................... 2

BasicEnvironmentConfigurationRequirements.......................................................................................... 3

FailoverSupportConfigurationDetails......................................................................................................... 4

ConfigurationSamples .................................................................................................................................. 4

LT05SpecificRequirementsForFailoverSupport ......................................................................................11

Heterogeneousvalidatedconfigurations ...................................................................................................13

ConfiguringyourEnvironmenttoSupportFailover.................................................................................... 15

DellPowerVault™TL2000/TL4000LibraryFailoverSetup.......................................................................... 16

TaketheLibraryOffline............................................................................................................................... 16

UpgradeLibraryandDriveFirmwaretotheLatestVersion .......................................................................16

BackupHostControlPathFailoverSetup ...................................................................................................18

BackupApplicationSetupandSupport ......................................................................................................18

FailoverConfigurationVerification.............................................................................................................20

FailoverTestProcedure ..............................................................................................................................20

FailoverPerformanceconsiderations .........................................................................................................21

AppendixA‐Recoveringfromafailoverevent ..........................................................................................22

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DellPowerVault™TL4000/TL2000FailoverGuide

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2|Page12/31/09version2.0

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

WhatisFailover?

FailoverisanoptionalfeatureavailablefortheDellPowerVaultTMTL4000andTL2000Tapelibraries.

Failoverisdesignedtoprovideautomaticpathfailovertoapreconfiguredredundantpathintheevent

thatahostadapterorcontrolpathdriveislostwithoutabortingthecurrentjobinprocess.Failover

provideserrorrecoveryonanalternatepathwhenapermanenterroroccursontheprimarypath.The

failovereventisenabledbythetapelibraryandhandledbythedevicedrivermakingittransparentto

therunningBackupApplication.

TherearetwotypesofPathFailover,DataPathFailover(DPF)andControlPathFailover(CPF).Theyare

closelyrelatedhoweverthedifferenceisthatDPFisanautomaticfailoversupportforthetransferof

data,whichprovideserrorrecoveryforsystemsconnectedtotapedriveswhileCPFisanautomatic

failoversupportforthetransferofcommandstomovetapecartridges.PleaserefertotheFailover

supportedconfigurationsectionsofthisdocumentforexamplesofdifferentconfigurationsthatcanbe

constructed.

DellPowerVault™TL2000/TL4000ConfigurationSupportmatrix

Theconfigurationmatrixsectionprovidesaquickreferencetodriveconfigurationsthatsupportfailover

inaDellPowerVault™TL2000orTL4000library.

ImportantNote:FailoverisnotsupportedforanyconfigurationcontainingLT03drives

LT03DrivesLT04DrivesLT05DrivesDrive

ConfigurationSupported

Drive

Failover

Support

Supported

Drive

Failover

Support

Supported

Drive

Failover

Support

SCSIFullHeightYesNo    

FCFullHeightYesNoYesNo  

FCHalfHeight     YesYes*

SASFullHeightYesNoYesNo  

SASHalfHeight   YesNoYesYes*

Table1:DellPowerVault™TL2000SupportedFailoverConfigurationMatrix

*RequiresaDellPowerVault™TL2000libraryconfiguredwithtwoLT05HalfHeightdrives

DellPowerVault™TL4000/TL2000FailoverGuide

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3|Page12/31/09version2.0

Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates

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LT03DrivesLT04DrivesLT05DrivesDrive

ConfigurationSupported

Drive

Failover

Support

Supported

Drive

Failover

Support

Supported

Drive

Failover

Support

SCSIFullHeightYesNo    

FCFullHeightYesNoYesYes*  

FCHalfHeight     YesYes*

SASFullHeightYesNoYesYes**  

SASHalfHeight   YesNoYesYes*

Table2:DellPowerVault™TL4000SupportedFailoverConfigurationMatrix

*RequiresaDellPowerVault™TL4000libraryconfiguredwithatleasttwoLT05HalfHeightdrives;two

homogeneousLTO4drivesareneededinthesamepartitiontosupportfullpathfailover.

**IfonlyoneLTO4SASdriveisinstalledinthelibraryorinthepartition,datapathfailoveronlyis

supported.

BasicEnvironmentConfigurationRequirements

Therearesomebasicconfigurationenvironmentsthatarerequiredinordertosupportthefailover

featureavailableintheDellPowerVault™TL2000/TL4000library.Refertotablebelowforfulldetails

ImportantNotes:

Mixeddrivegenerationsarenotrecommended;however,ifalibrarycontainsmixedgenerationdrives

inasinglepartition,andfailoverisadesiredconfiguration,youmustfollowtheLT05environment

configurationrequirementsandthelibrarymustcontainonlyLT04mediaforbackups.

FailoverissupportedwithasingleLTO4SASdriveinstalledintheTL4000libraryorinasinglelibrary

partition;however,onlydatapathfailovercanbeconfigured.

TwohomogeneousLTO4drivesarerequiredinthesamelibrarypartitiontosupportfullpathfailover.

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DellPowerVault™TL4000/TL2000FailoverGuide

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4|Page12/31/09version2.0

Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates

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LT04ConfigurationsLT05Configurations

•Twohomogeneous(FibreChannelorSAS)

LTO4fullheightdrivesinasinglelibrary

partition

•Controlpathenabledonalldrivesinthe

partition

•MicrosoftWindows2003,Windows2008

orWindows2008R2installedinthehost

server

•DellPowerVault™TL4000librarydevice

driverrunningonhostserver

•CommVaultGalaxy6.1SP4orlateror

CommvaultSimpana7.0SP4orlater

installedinthehostsystem

•Failoveractivatedvialicensekeyonthe

DellPowerVault™TL4000library

•SharedStoragelicenseappliedtothe

CommVaultbackupapplication

•Twoormorehomogeneous(Fibre

ChannelorSAS)LTO5drivesinasingle

librarypartition

•Controlpathenabledonalldrivesinthe

partition

•MicrosoftWindows2003,Windows2008,

orWindows2008R2installedonthehost

server

•DellPowerVault™TL4000\TL2000library

devicedriverrunningonhostserver

•CommVaultGalaxy7.0SP4orlater

installedinthehostsystem

•Failoveractivatedvialicensekeyonthe

DellPowerVault™TL4000orTL2000

library

•SharedStoragelicenseappliedtothe

CommVaultbackupapplication

Table3:FailoverConfigurationRequirements

FailoverSupportConfigurationDetails

Thissectiondetailstheconfigurationrequirementsthatmustbemeetinordertosupportfailoverusing

theDellPowerVault™TL2000orTL4000library.

ImportantNote:FailoversupportislimitedtotheDellPowerVault™TL4000whenconfiguredwithLT04

drives.

ConfigurationSamples

Pleaserefertothefollowingdiagramsforcablingthesupportedfailoverconfigurations.Thedrive

shownasthefailoverpathdoesnotneedtobeonstandby(i.e.notinuse)forfailovertooccur.

FailoverReferenceConfiguration1:

Onehost,oneFibreChannelswitchandoneDellPowerVault™librarywithtwoFibreChannel

drives

Inthisconfiguration,failoveroccursifoneofthedrivesinthelibraryfails(hardwarefailureordriveis

disconnectedfromtheFibreChannelswitch).Thephysicalconnectionofthisconfigurationisshownin

Figure1.

ImportantNote:TheFibreChannelDriveGenerationcanbeLT04orLT05

DellPowerVault™TL4000/TL2000FailoverGuide



5|Page12/31/09version2.0

Failoverconfiguration

(onehost,oneswitch,twoFCdrives)

MainPath Failover Path



Figure1:ReferenceConfiguration1

FailoverReferenceConfiguration2:

OneHostwithonedualportFibreChannelHBA,twoFibreChannelswitchesandoneDell

PowerVault™withtwoFibreChanneldrives

Inthisconfiguration,failoveroccursifoneofthefollowingoccurs:

‐Oneofthedrivesinthelibraryfails(hardwarefailureordriveisdisconnectedfromtheFibre

Channelswitch)

‐Oneoftheswitchesfails

‐OneoftheHBAportsfails

ThephysicalconnectionofthisconfigurationisshowninFigure2.

ImportantNote:DellRecommendsFibreChanneldrivestobesamegeneration.ForHeterogonous

configurationsrefertosection:HeterogonousValidatedConfigurations



Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates



DellPowerVault™TL4000/TL2000FailoverGuide



6|Page12/31/09version2.0

Failoverconfiguration

(onehost,twoHBAs,twoswitches,twoFCdrives)

MainPath Failover Path



Figure2:ReferenceConfiguration2

FailoverReferenceConfiguration3:

OnehostwithdualportSASHBAsandoneDellPowerVault™withtwoSASdrives

Inthisconfiguration,failoveroccursifoneofthefollowingoccurs:

‐Oneofthedrivesfails(hardwarefailureorisdrivedisconnectedfromtheHBAport)

‐OneoftheHBAportsfails

‐Oneoftheportsinadrivefails

Thisconfigurationtakesfulladvantageofpathfailover;itisprotectedviadataandcontrolpath.

ThephysicalconnectionofthisconfigurationisshowninFigure3.

ImportantNote:DellRecommendsFibreChanneldrivestobesamegeneration.ForHeterogonous

configurationsrefertosection:HeterogonousValidatedConfigurations





Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates



DellPowerVault™TL4000/TL2000FailoverGuide



7|Page12/31/09version2.0

Failoverconfiguration

(onehostwithtwoHBAs,andtwoSASdrives)

MainPath Failover Path



Figure3:ReferenceConfiguration3

FailoverReferenceConfiguration4:

OneHostwithdualFibreChannelHBAs,twoFibreChannelswitchesandaDellPowerVault™

withtwoFibreChanneldrives

Inthisconfiguration,failoveroccursifoneormoreofthefollowingoccurs:

‐Oneofthedrivesfails(hardwarefailureorisdrivedisconnectedfromtheHBAport)

‐OneoftheHBAcontrollersfails

‐Oneoftheswitchesfails

ThephysicalconnectionofthisconfigurationisshowninFigure4.

ImportantNote:DellRecommendsFibreChanneldrivestobesamegeneration.ForHeterogonous

configurationsrefertosection:HeterogonousValidatedConfigurations



Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates



DellPowerVault™TL4000/TL2000FailoverGuide



8|Page12/31/09version2.0

Failoverconfiguration

(HostwithdualportHBAs,twoFCswitches,andtwoFCdrives)

MainPath Failover Path



Figure4:ReferenceConfiguration4

FailoverReferenceConfiguration5:

TwohostswithdualFibreChannelHBAs,twoFibreChannelswitchesandoneDell

PowerVault™withtwoFibreChanneldrives

Inthisconfiguration,failoveroccursifoneormoreofthefollowingoccurs:

‐Oneofthedrivesfails(hardwarefailureorisdrivedisconnectedfromtheHBAport)

‐OneoftheHBAcontrollersfails

‐Oneoftheswitchesfails

ThephysicalconnectionofthisconfigurationisshowninFigure5.

ImportantNote:DellRecommendsFibreChanneldrivestobesamegeneration.ForHeterogonous

configurationsrefertosection:HeterogonousValidatedConfigurations



Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates



DellPowerVault™TL4000/TL2000FailoverGuide



9|Page12/31/09version2.0

MainPath Failover Path

MultipleHostFailoverconfiguration

(twohosts,twoFCswitches,and2FCdrives)



Figure5:ReferenceConfiguration5

NotethataSANenvironmentissusceptibletobackupperformanceissuesduetothesharingof

resourcesacrossmultiplehosts.Afailovereventinthesystemcanpotentiallycomplicatethe

performanceissues.Failoverisameanstomaintainthedatastorageflowintheeventofafailurealong

thecommunicationpathbetweenthehostandthedriveorlibrary,buttheenvironmentmanagermust

monitorthestateofthesystemtoensureallthepathsareactive.



FailoverReferenceConfiguration6:

OnehostwithdualportSASHBAandoneDellPowerVault™withasingleSASdrive

Inthisconfiguration,failoveroccursonlyifoneoftheHBAsfails.Thisconfigurationonlysupportsdata

pathfailoverasthereisnoseconddrivetofailoverthecontrolpath.Thephysicalconnectionofthis

configurationisshowninFigure6.



Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates



DellPowerVault™TL4000/TL2000FailoverGuide



10|Page12/31/09version2.0

SingleSASDriveFailoverConfiguration

(onehostwithtwoHBAs,andOneSASdrive)

MainPath Failover Path



Figure6:ReferenceConfiguration6

FailoverReferenceConfiguration7:

OnehostwithtwoFibreChannelHBAs,oneFibreChannelswitchandoneDellPowerVault™

withaSingleFibreChanneldrive

Inthisconfiguration,failoveroccursonlyifoneoftheHBAsfails.Thisconfigurationonlysupportsdata

pathfailoverasthereisnoseconddrivetofailoverthecontrolpath.Thephysicalconnectionofthis

configurationisshowninFigure7.



Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates



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