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Chapter 16 Using Snapshots

Snapshots and Other Activity in the Virtual Machine

Whenyoutakeasnapshot,beawareofotheractivitygoingoninthevirtualmachine

andthelikelyeffectofrevertingtothatsnapshot.Ingeneral,itisbesttotakeasnapshot

whennoapplicationsinthevirtualmachinearecommunicatingwithothercomputers.

Thepotentialforproblemsis

greatestifthevirtualmachineiscommunicatingwith

anothercomputer,especiallyinaproductionenvironment.

Forexample,ifyoutakeasnapshotwhilethevirtualmachineisdownloadingafile

fromaserveronthenetwork,thevirtualmachinecontinuesdownloadingthefile,

communicatingitsprogresstotheserver.Ifyou

reverttothesnapshot,communications

betweenthevirtualmachineandtheserverareconfusedandthefiletransferfails.

Anotherexampleistakingasnapshotwhileanapplicationinthevirtualmachineis

sendingatransactiontoadatabaseonaseparatemachine.Ifyoureverttothat

snapshot—especiallyif

yourevertafterthetransactionstartsbutbeforeithasbeen

committed—thedatabaseislikelytobeconfused.

Taking a Snapshot

Takingasnapshotisasynchronousoperation.Alluseroperationstothevirtual

machineduringthisperiodareblockedforsnapshotanddataconsistency.Thetime

takentodevelopasnapshotdependsontheamountofdataandtheloadontheserver.

Onaverage,thetimerangesfrom30to

40secondsforminimalsnapshotcreation.

Youcantakeasnapshotwhileavirtualmachineispoweredon,poweredoff,or

suspended.Ifyouaresuspendingavirtualmachine,waituntilthesuspendoperation

hasfinishedbeforetakingasnapshot.

Youmustpoweroffthevirtualmachinebeforetakingasnapshot

ifthevirtualmachine

hasmultipledisksindifferentdiskmodes.Forexample,ifyouhaveaspecialpurpose

configurationthatrequiresyoutouseanindependentdisk,youmustpoweroffthe

virtualmachinebeforetakingasnapshot.

To take a snapshot

1 ChooseInventory>VirtualMachine>Snapshot>TakeSnapshot.

Youcan

alsoclicktheTakeasnapshotofthisvirtualmachinebutton,orright‐click

thevirtualmachineandchooseSnapshot>TakeSnapshot.

TheTakeVirtualMachineSnapshotwindowappears.

2Typeanameforyoursnapshot.

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ESX QE450.2 Spezifikationen Seite 251