Spectra T50e - Page 161

Chapter 6—Configuring and Managing Partitions Partition Overview
August 2017 User Guide—Spectra T50e Library
159
Configuration Requirements for a Global Spare Drive Beforeyoucan
configureapartitiontousetheGlobalSpareoption,thefollowing
requirementsmustbemet:
 ThepartitionmustuseFibreChannelorSASLTOdrives.TheGlobal
SparefeatureisnotavailableforSCSILTOdrives.
 Inadditiontothedrivesassignedtothepartitionforusebythehost
software,thelibrarymusthaveavailableatleastonedriveofthesame
technologygenerationandinterfacetypeasthedrivestheGlobalSpare
wouldreplace.Forexample,youcannotuseanLTO‐4driveasa
spare
foranLTO‐5drivenorcanyouuseaSASLTO‐5driveasasparefora
FibreChannelLTO‐5drive.
 AGlobalSparedrivecanbesharedbymultiplepartitions.However,
thedrivecanonlybeusedbyonepartitionatatime.
 Ifadriveoftherequiredtypeisalreadyinstalledinthelibrary,youcan
configureadriveasaGlobalSpareaspartoftheinitialpartition
creationprocess.Ifyoudonotcurrentlyhaveadrivethatcanbeused
asaGlobalSpareinstalledinthelibrary,butinstallonelater,youcan
editthepartitiontoconfigureGlobalSpares.
 ThetypeofdriveyouselectastheGlobalSparedeterminesthetypeof
drivesthatyoucanassigntothepartition.
 WhenselectingthedrivetobetheGlobalSpare,thelibraryprevents
youfromselectingdrivesthatcannotbeusedasGlobalSpares.
 AFibreChanneldrivethatisconfiguredasaGlobalSparemustbe
connectedtothesameFibreChannelarbitratedlooporfabricasthe
drivesitwouldreplace.IfisarenotconnectedtothesameFibre
Channelarbitratedlooporfabric,itisnotaccessibletotheapplication
software.YoumayneedtoreconfigureyourswitchtoaccesstheGlobal
Sparedrive.
Similarly,aSASGlobalSparedrivemustbeconnectedtothesamehost
orSASexpanderasthedrivesitwouldreplace.
Global Spare Requirements for Using PostScan Ifyouplantouseoneof
theMLMPostScanoptionsthatrequiresaGlobalSparedrive(seeEnable
andConfigureMLMPreScanandPostScanonpage177),youmust
configureatleastoneGlobalSparedriveforthepartition.
KeepinmindthatwhenthePostScanprocessstarts,it“owns”theGlobal
SparedriveitisusinguntilallofthecartridgesinthePostScanqueueare
processed(unlessyoupausethePostScanoperationasdescribedinPause
thePostScanProcessonpage254).IfaGlobalSparedriveisbeingusedfor
PostScanitisnotavailableforuseasaspare.
Note: SeeUsingPostScanonpage247forinformationaboutthe
PostScanfeature.