Sun Microsystems Virtual Tape Library Manual de usuario descargar pdf (Pagina 26)

Key VTL features and options

12 VTL User Guide • May 2008 G • 96267

AutomatedTapeCaching

TheAutomatedTapeCachingoption presentsbackupapplicationswithvirtualtape

volumesthatarephysicallyimplementedondisk,tape ,orboth.Thiskeepsthe

implementat ion simple—thebackupapplicationmanages onlythevir tual tape

volumesandvirtuallibrarie s— w hile givingthebackupadministratortheabilityto

finetunethephysicalimplementationforbest

performancean d reliability.

VTLsoftwarecanimplementvirtualtapevolumesandvirtuallibrar ies usingan

optimalcombinationofre source s:diskarrays,physicaltapes,physical libraries,and

physical tapedrives.VTLpoliciesspecifywheredatashouldreside—ondiskforfast

randomaccess,ontapeforlongertermstorage,oronboth for

maximum

redundancy—andforhowlong.Underpolicycontrol,VTLsoftwarecan

automaticallycopybackupsetsfromdisktotape,ou tside ofthebackupwindow.It

canretainthebackupsetsinthediskcacheforaspecifiedperiod,sothatuserscan

rapidlyrestoredataduringthepe riodwhenthe

needishighest.Itcanthenfreeup

thediskcachefornewbackupsetswhileretaininganimageontape.Ifarestoreis

necessa ry,apointer inthediskcachepoi ntstherequesttothephysicaltapeimage,

transparentlyandautomatically.TheAutomatedTapeCachingoptionthus

simplifiesand

automatesmanagement ofthedisk cache,insurin gadequatecapacity

withminimumdiskresources.

Policiescanbebuiltaroundthenumberofdaysthatdatasetsresideondisk,around

adisk‐capacityhig hwatermark,oraroundaspecifiedeventortimeofday.Physical

tapeI/Ocanthusberun

asabackgroundprocessthatdoesnotinterferewith

productiondatacenteroperations.

Note – AutomatedTape Cac hi n g an d AutoArchive/Replicationcannotbeusedat 

thesametim eonthesamevirtuallibra ry.

Virtualtapereplication

Replicatingdataprovides additionalprotectionfortheinformati on onavirtualtape

bymaintainingacopylocallyoronanotherVTLserver.VTLsoftwaresupports

threereplicationmethods,twoofthemautomaticandone amanualprocessthat can

beusedifyouarenotusingtheautomaticmethods.

Seethe

followingsubsectionsforadditionalinformation:

■ “A u t o Replication”onpage 13

■ “Replication”onpage 13

■ “RemoteCopy”onpage 14.

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Sun Microsystems Virtual Tape Library Manual de usuario Pagina 26