Dell PowerVault TL2000 - What Is Failover; Dell Powervault TL2000;TL4000 Configuration Support Matrix

DellPowerVault™TL4000/TL2000FailoverGuide
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2|Page 12/31/09 version 2.0
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Alwaysrefertowww.dell.com\supportforlatestdocumentationandupdates
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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red undant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whil e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
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Failover
Support
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Supported
Drive
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Failover
Support
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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