Spectra T950 - Operational Overview

Chapter 9 — Configuring and Using Media Lifecycle Management Using PostScan
November 2016 User Guide—Spectra T950 Library
300
Operational Overview
PostScan—eitherFullScanorQuickScan—performsareadability
verificationtesttoverifydataintegrityforallofthecartridgesinthe MLM
database.FullScanusesanLTO‐4orlatergenerationorTS11x0technology
GlobalSparedriveassigned tothepartitionandQuickScanusesanLTO‐5
orlatergenerationorTS11x0technologydrive inthe
partitionorGlobal
Sparedri veassignedtothepartitiontocheckeachcartridgeinthepartition
formediaerrorsthatcanimpacttheabilitytorestorethedata.
ThePostScanprocessisperformedbythelibraryindependentofthe
storagemanagementsoftwarenormallyusedtoreadandwritedatatothe
tape.YoucanchoosetoperformPostScaneitherautomaticallyor
manually.Forautomaticscansyoucansetthescanningfrequencyand
selectoptionstodeterminethetypeofscanperformed.
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
cartridges.CartridgesthatarenotMLM‐enabledmustbe
manuallyaddedtothePostScanqueue(seeRequestaManual
PostScanonpage305).
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199).
 ThelibraryisnotcurrentlyinaPostScanblackoutperiod(see
ConfigurePostScanBlackoutPeriodsonpage292).
 IfFullScanisenabled,an LTO‐4orlatergenerationorTS11x0
technologyGlobalSparedriveassignedtothepartitionisavailable.
—OR—
IfQuickScanisenabled,anLTO‐5orlatergenerationorTS11x0
technologydriveinthesamepartitionasthecartridgethatmetthe
PostScantriggercriteriaisavailable.
—OR—
IfQuickScanwithSpareDrivesisenabled,anLTO‐5orlater
generationorTS11x0technologyGlobalSpare driveassignedtothe
partitionisavailable.