Dell PowerVault TL2000 User manual

DellPowerVault™TL4000/TL2000FailoverGuide


1|Page12/31/09version2.0
Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates

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


DellPowerVault™TL4000/TL2000FailoverGuide


2|Page12/31/09version2.0
Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates


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


3|Page12/31/09version2.0
Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates


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.


DellPowerVault™TL4000/TL2000FailoverGuide


4|Page12/31/09version2.0
Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates

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
