ESX QE450.2 Specifikace stáhnout pdf (Strana 250)

Basic System Administration

250 VMware, Inc.

Whenyoureverttoasnapshot,youreturnalltheseitemstothestatetheywereinatthe

timeyoutookthatsnapshot.Ifyouwantthevirtualmachinetobesuspended,powered

on,orpoweredoffwhenyoulaunchit,besureitisinthecorrectstatewhen

youtake

thatsnapshot.

Snapshotsareusefulwhenyouneedtorevertrepeatedlytothesamestatebutyoudon’t

wanttocreatemultiplevirtualmachines.Withsnapshots,youcreatebackupand

restorepositionsinalinearprocess.Youcanalsopreserveabaselinebeforediverging

avirtualmachineina

processtree.

Snapshotscanbeusedasrestorationpointsduringalinearoriterativeprocess,suchas

installingupdatepackages,orduringabranchingprocess,suchasinstallingdifferent

versionsofaprogram.Takingsnapshotsensuresthateachinstallationbeginsfroman

identicalbaseline.

Multiplesnapshotsreferstotheabilityto

createmorethanonesnapshotofthesame

virtualmachine.Totakesnapshotsofmultiplevirtualmachines,(forexample,

snapshotsforallmembers ofateam)requiresthatyoutakeaseparatesnapshotofeach

teammember.

Multiplesnapshotsarenotsimplyanewwayofsavingyourvirtualmachines.With

multiplesnapshots,youcansavemanypositionstoaccommodatemanykindsofwork

processes.

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Althoughyoucantakesnapshotsupto32levels,theamountoftimeit

takestocommitordeletethosesnapshotsincreasesasthelevelsgetdeeper.The

requiredtimeisdirectlyproportionaltotheamountofdata(committedordeleted)and

thevirtualmachine’sRAMsize.

Relationship Between Snapshots

Therelationshipbetweensnapshotsislikethatofaparenttoachild:

 Inthelinearprocess,eachsnapshothasoneparentandonechild,exceptforthe

lastsnapshot,whichhasnochildren.

 Intheprocesstree,eachsnapshothasoneparent,butonesnapshotmayhave

morethanonechild.Manysnapshotshavenochildren.

Youcanreverttoaparentorachild.

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ESX QE450.2 Specifikace Strana 250