Spectra T50e - Using Post Scan

Chapter 8—Configuring and Using Media Lifecycle Management Using PostScan
August 2017 User Guide—Spectra T50e Library
248
USING POSTSCAN
ThissectionprovidesdetailedinformationabouthowPostScanoperates,
aswellasprerequisitesforusingPostScanandperformingmanual
PostScanoperations.
PostScanisenabledandconfiguredforeachindividualpartition.PostScan
doesnotoperateuntilthePostScanoptionisselectedandoneormore
triggersarespecifiedforthepartitionarereached(seeEnableand
ConfigureMLMPreScanandPostScanonpage177).
Note: PostScanandSpectraSKLMencryptionkeymanagementcannot
beconfiguredforuseinthesamepartition.
Operational Overview PostScan,whichhasthreeoperationoptions—
FullScan,QuickScan,andQuickScanusingaGlobalSpare,performsaread
verificationtestoneachLTOcartridgeinthepartitiontocheckthedata
integrityandidentifymediaerrorsthatcanimpact thelibrary’sabilityto
restoredata.TheFullScanandQuickScanusingaGloba lSpare optionsuse
anLTO‐4orlatergenerationGlobalSparedriveassignedtothepartition;
theQuickScanoptionusesan LTO‐4orlatergenerationdriveassignedto
thepartition.
AllthreePostScanoptionsoperateasabackgroundprocessperformedby
thelibraryindependentofthestoragemanagementsoftwarenormally
usedtoreadandwritedatatothetape.Youcanconfigureapartitiontorun
PostScanautomatically(seeEnableandConfigureMLMPreScanand
PostScanonpage177)oryoucanstartthePostScanprocessmanually.For
automaticscansyoucansetthescanningfrequencyandselectthePostScan
optiontouse.
UsingFullScanontapesthatarewrittenusingvariable‐lengthblocksizes
isnotrecommended.
Prerequisites for Starting a PostScan Operation WhenanMLM‐enabled
cartridgemeetsthePostScantriggercriteriaconfiguredforthepartition,
thecartridgeisaddedtothePostScanqueue.Thequeueisprocessedina
first‐in‐first‐out(FIFO)basis.
Note: TheautomaticPostScantriggersonlyapplytoMLM‐enabled
LTOcartridges.LTOcartridgesthatarenotMLM‐enabledmust
bemanuallyaddedtothePostScanqueue(see
Schedulea
ManualPostScanonpage251).
BeforebeginningthePostScanprocess,thelibraryverifiesthatthe
followingprerequisitesaremet:
 Thesystemisidlefortheperiodoftimespecifiedforthepartition(see
EnableandConfigureMLMPreScanandPostScanonpage177).
 ThelibraryisnotcurrentlyinaPostScanblackoutperiod(see
ConfigurePostScanBlackoutPeriodsonpage239).