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


DellPowerVault™TL4000/TL2000FailoverGuide


11|Page12/31/09version2.0
SingleFCDriveFailoverconfiguration
(TwoHBAadapters,OneFCswitch,andoneFCdrive)
MainPath Failover Path

Figure7:ReferenceConfiguration7
LT05SpecificRequirementsForFailoverSupport
TheintroductionofLT05drivesupportintheDellPowerVault™TL2000andTL4000allowedadditional
failoverconfigurations.TheseconfigurationsareuniquetotheDellPowerVault™TL2000andTL4000
configuredwithLT05devicesanddonotextendtoLT04configurations.
ImportantNote:FailoverisonlysupportedonDellPowerVault™TL2000whenconfiguredwithLT05
drives
FailoverReferenceConfiguration8:
OnehostwithtwoFibreChannelports,oneFibreChannelswitch,andaDellPowerVault™
configuredwiththree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FibreChannelportsintheHBAfails

Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates


DellPowerVault™TL4000/TL2000FailoverGuide


12|Page12/31/09version2.0
Failoverconfiguration
(onehost,twoFCHBAs,OneFCswitch,threeFCdrives)
MainPath Failover Path

Figure8:ReferenceConfiguration8
ImportantNote:ThisconfigurationcanbeextendedtouptwofourLT05drives
FailoverReferenceConfiguration9:
OnehostwiththreedualportSASHBAsandaDellPowerVault™configuredwiththreeSAS
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controllerportfails
‐OneportinaSASdrivefails


Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates


DellPowerVault™TL4000/TL2000FailoverGuide


13|Page12/31/09version2.0
Failoverconfiguration
(onehostwiththreedualportHBAs,andthreeSASdrives)
MainPath Failover Path

Figure9:ReferenceConfiguration9
ImportantNote:Thisconfigurationcanbeextendeduptofourdrivesprovidedthehostsystemcan
supportfourdualSAsHBAs.
Heterogeneousvalidatedconfigurations
Heterogonousconfigurationshavesomelimitations,iftheconfigurationcontainsLT04andLT05drives,
theLibrarymustcontainonlyLT04mediaforproperoperations.
ImportantNote:HeterogeneousconfigurationscontainingLT03drivesarenotsupported
FailoverReferenceConfiguration10:
Onehost,oneFibreChannelswitchandonePowerVault™libraryconfiguredwithoneLT04
FibreChannelandoneLT05FibreChanneldrive
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10

Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates


DellPowerVault™TL4000/TL2000FailoverGuide


14|Page12/31/09version2.0
Failoverconfiguration
(onehost,oneswitch,twoFCdrives)
MainPath Failover Path

Figure10:ReferenceConfiguration10
FailoverReferenceConfiguration11:
OnehostwithtwodualportSASHBAsandonePowerVault™withoneLT04SASandLT05
SASdrive
Inthisconfiguration,failoveroccursifoneofthedrivesinthelibraryfails(hardwarefailureordriveis
disconnectedfromtheHBA).
IntheeventasingleportintheSASdrivefails,failoverwilltakeeffectanddatawillbestreamedonto
thesamedriveusingthesecondSASconnection.
IntheeventaSASdrivefails;failoverwillresultoncontrolpathanddatamovedtotheadditionaldrive
inthelibrary
ThephysicalconnectionofthisconfigurationisshowninFigure11

Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates


DellPowerVault™TL4000/TL2000FailoverGuide


15|Page12/31/09version2.0
Failoverconfiguration
(onehostwithtwoHBAs,andtwoSASdrives)
MainPath Failover Path

Figure11:ReferenceConfiguration11
ConfiguringyourEnvironmenttoSupportFailover
Ensureyouhavethefollowingforsuccessfulenvironmentconfiguration:
•DellPowerVault™TL2000orTL4000configuredwithfailovercapabledrives.Pleasereferto
failoverconfigurationsupportmatrix.
•AnetworkconnectiontoyourDellPowerVault™TL2000/TL4000libraryformanagement
purposes.RefertotheDellPowerVault™TL4000\TL2000TapeLibraryUser’sGuideformore
information
•ADellPowerVault™TL4000\TL2000TapeLibraryfailoverlicense
•Ahostsystemconfiguredwithasmanytapeconnectionsneededforyourenvironment.
•Enoughcablestomakethenecessaryconnectionsneededforyourenvironment
•AFibreChannelswitchifutilizingaFibreChannelconfiguration
•CommVaultBackupApplication
a. ForDellPowerVault™TL4000withLT04drives
i. CommVaultGalaxy6.1SP4orlaterwithSANlicenseenabled
b. ForDellPowerVault™TL2000/TL400withLT05drives
i. CommVaultSimpana8.0SP4orlaterwithSANlicenseenabled
ii. PatchtosupportLT05tapeapplied

Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates


DellPowerVault™TL4000/TL2000FailoverGuide


16|Page12/31/09version2.0
Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates

•DellPowerVault™TL2000/TL4000MicrosftWindowsdevicedriver.Thedrivercanbe
downloadedfromDellsupportsite:http://support.dell.com

ImportantNote:PleaserefertoDellPowerVault™CompatibilityMatrixforlatestsupportedOSlist,
BackupapplicationandDellPowerVault™Tapeconfigurations.
http://support.dell.com/support/edocs/stor‐sys/matrix/PVMatrix/index.htm

DellPowerVault™TL2000/TL4000LibraryFailoverSetup
TaketheLibraryOffline
Beforestartingthefailoverconfigurationprocess,itisimportanttoensurenobackupjobsare
runningandlibraryresourcesarenotcontrolledbythetapebackupapplication
FollowtheinstructionsfortakingthelibraryofflineintheDellPowerVault™TL2000TapeLibrary
andTL4000TapeLibraryUser’sGuide.Intheeventyoudonothaveacopyofthisdocument,it
canbedownloadedfromtheDellsupportsiteathttp://support.dell.com.
UpgradeLibraryandDriveFirmwaretotheLatestVersion
EnsureyourDellPowerVault™TL2000/TL4000libraryhasthelatestlibraryanddrivefirmware.
Thelatestfirmwarecanbefoundathttp://support.dell.com.
Ifafirmwareupgradeisneeded,followtheinstructionsincludedinthefirmwaredownload
packagelocatedathttp://support.dell.com.
Applythefailoverlicensetothelibrary
Inordertosupportfailover,alicensemustbeenteredintoyourlibrary.Ifalicenseisneeded,
pleasecontactyourDelltechnicalsalesrepresentative.Followthestepsprovidedwithyour
failoverdocumentationtoobtainthelicenseforyourlibrary.
FailovercanbeenabledviatheRemoteManagementUnit(RMU)ortheOperatorControlPanel
(OCP).Selectthemethodyoupreferandfollowtheinstructionsbelow.
EnteringPathFailoverLicenseActivationKeyviatheRemoteManagement
Interface(RMU)
Ifyouorderedfailoveratpointofsale,theenvelopecontainingthefailover
authorizationcodeislocatedintheaccessoryboxthatcamewithyourunit.Ifyou
orderedfailoverafterpointofsale,anenvelopecontainingyourfailoverauthorization

DellPowerVault™TL4000/TL2000FailoverGuide


17|Page12/31/09version2.0
codewassenttoyou.Pleasefollowtheinstructionsonthefailoverauthorizationcode
certificatetoobtainyourlicensekey.Theauthorizationcodeyouweresentwillnot
activatethefeatureonthelibrary.
PleaserefertotheDellPowerVault™TL2000TapeLibraryandTL4000TapeLibrary
User’sGuideforinstructionsonaccessingandnavigatingtheRMU.
Thelibraryvalidatestheenteredlicensekeyandprovidesa“FailoverEnabled”message
uponsuccessfulcompletion.Intheeventyouenterthewronglicensekey,thelibrary
returnsa“KeyNotValidated”failuremessage.
1.NavigatetoConfigureLibrary→PathFailover.
2.EnterthePathFailover12‐digitlicensekeyinthespacesprovided.

Figure12:PowerVault™TL4000FailoverActivationscreen
3.ClickActivatetosavethelicensekeyandactivatefailoveronthelibrary.Thefollowing
screendisplaysifyouhavecorrectlyenteredthelicensekey.

Figure13:PowerVault™TL4000RMUscreenafterfailoverhasbeenactivated

EnteringPathFailoverFeatureActivationKeyviaOperatorControlPanel(OCP)
Ifyouorderedfailoveratpointofsale,theenvelopecontainingthefailover
authorizationcodeislocatedintheaccessoryboxthatcamewithyourunit.Ifyou
orderedfailoverafterpointofsale,anenvelopecontainingyourfailoverauthorization
codewassenttoyou.Pleasefollowtheinstructionsonthefailoverauthorizationcode
certificatetoobtainyourlicensekey.Theauthorizationcodeyouweresentwillnot
activatethefeatureonthelibrary.
PleaserefertotheDellPowerVault™TL2000tapeLibraryandTL4000Tapelibrary
User’sGuideforinstructionsfornavigatingwiththeOCP.

Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates


DellPowerVault™TL4000/TL2000FailoverGuide


18|Page12/31/09version2.0
Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates

Thelibraryvalidatestheenteredlicensekeyandprovidesa“FailoverEnabled”message
uponsuccessfulcompletion.Intheeventyouenterthewronglicensekey,thelibrary
returnsa“KeyNotValidated”failuremessage.
1.NavigatetoConfigure→PathFailover
2.PresstheSELECTbuttontohighlightthefirstdigitofthe12‐digitlicensekey.
3.UsetheUPandDOWNbuttonstoselecteachdigit.
4.PresstheSELECTbuttontomovetothenextdigit.
5.Afterenteringthefinaldigit,presstheDOWNbuttonandselectoneofthefollowing:
‐Save‐toapplyyoursettings
‐Cancel‐todeleteyoursettings

ConfiguretheDellPowerVault™TL2000/TL4000controlpathinthesecondary
drives
Bydefault,thelibraryhasonlyonecontrolpathviadrive1inthelibraryregardlessofthenumber
ofdrivesinstalled.Inordertoconfigurecontrolpathfailover,youmustenablethecontrolpath
inthedrivesettingsforthesecondarydrivePleaserefertotheDellPowerVault™TL2000Tape
LibraryandTL4000TapeLibraryUser’sGuideforinstructionsonenablingcontrolpath.Enabled
controlpathforalladditionaldrivesinthelibrary
BringtheLibraryBackOffline
PleaserefertotheDellPowerVault™TL2000TapeLibraryandTL4000TapeLibraryUser’sGuide
forinstructionsonbringingthelibrarybackonline.
BackupHostControlPathFailoverSetup
ThehostsystemmusthaveMicrosoftWindows2003,20080r2008R2(32‐or64‐bit).Youmustinstall
theDellPowerVault™TL4000devicedriveronyourbackuphostsystem.TheDellPowerVault™
TL2000/TL4000drivercanbedownloadedfromhttp://support.dell.com.Pleasefollowtheinstallation
Instructionsincludedinthedriverpackage.
VerifytheOSseesthelibrary.TherewillbeadriveslistedintheDeviceManagerforeachphysical
connectiontothedrive(s)
BackupApplicationSetupandSupport
CommVaultistheonlybackupapplicationthatcurrentlysupportsfailover.Installthebackup
application;pleaserefertoyourCommVaultdocumentationforinstallationinstructions
*ImportantNote:EnsureyourCommVaultinstallationinstallhasalltheupdatesrequiredforLT05tape
support

DellPowerVault™TL4000/TL2000FailoverGuide


19|Page12/31/09version2.0
Note:PleasefollowthestepsunderBackupApplicationSetupandSupportforConfiguringDualHost
BusAdaptersevenifyourlibraryconfigurationcontainsSASdrivesorFibreChanneldirectattached
drives.TheconfigurationsettingsunderConfiguringDualHostBusAdapterswillallowyourSASor
directattachedFibreChannelconfigurationtosupportfailover.
OnceCommVaultisinstalled,thereareadditionalstepstoconfigurefailover.AccesstheCommVault
failoverconfigurationinstructionsathttp://www.commvault.com/.
•NavigatetotheServicestab
•SelectSupportServicesthenDocumentation
•SelecttheBooksOnlinelinkforyoursoftwareversion
•Selectthesearchoptionlocatedintheupperrightsideofthepage
•Searchforkeywords"SAN‐AttachedLibraries”
•Locatethearticlenamed“SAN‐AttachedLibraries”andfollowtheinstructionsprovidedfor
“ConfiguringDualHostBusAdapters(HBA)”
OnceCommVaultiscorrectlyconfiguredforfailover,thescreenshowninFigure14belowisdisplayed.

Figure14:FullyconfiguredCommVaultApplication

Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates


DellPowerVault™TL4000/TL2000FailoverGuide


20|Page12/31/09version2.0
Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates

FailoverConfigurationVerification
Followthestepsinthetablebelowtotestyourconfigurationwascompletedsuccessfully.Thetest
procedurewilltakeyouthroughauser‐inducedfailovereventtovalidatetheconfiguration,
demonstratethefailoverbehavior,anddemonstraterestoringtheunitafterafailoverevent.
FailoverTestProcedure
Procedure Step
Number Test Procedure Expected Result
1 Configure your library per the instructions in this
document Configuration is complete and library is configured in CommVault
2 Verify your library is accessible by running a small backup
job with a piece of scarp media Job completes successfully
3 Start a new backup to a single tape drive.
Make note of the job ID.
Backup starts without error.
4
When the backup reaches the 50% mark disconnect the
cable from the back of the tape drive actively running
I/O.
Error message will be displayed in
the CommVault Event Viewer.
Media fails to unload.
Job status goes to a pending state.
5
Let job sit in Pending state for 5 minutes.
Right click the Job and select Resume.
Job restarts.
New media is loaded into the second
drive and job completes.
Media is unloaded.
6 Start another backup job to the library. Backup starts and completes.
7 Repair the broken link created in step 4
Verify OS recognizes the device
Device Manager shows device
correctly.
8 Reset the library drive that contains the "stuck" tape from
step 2. Refer to appendix A in this document Drive unloads the media.
9
Perform a restore of the Job ID noted in step 3
This will be the backup job that contained the failover
event.
Direct the restore job to an alternate location for file
comparison of the original data.
Restore begins and completes
without error.
10 Compare the data from the restore job to the original
data. Using your method of choice 100% match of the data.
11 Perform a backup that utilizes both drives in the library. Backups begin and run in parallel.
Jobs finish with success.