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Chapter 9 Preserving the State of a Virtual Machine
Using Snapshots
Takingsnapshotsletsyoupreservethestateofthevirtualmachinesothatyoucan
returntothesamestaterepeatedly.
Scenarios for Using Multiple Snapshots
Youcantakemultiplesnapshotsofavirtualmachine.
Snapshots in a Linear Process
Takingsnapshotsinalinearprocessmeanstakingasnapshot,continuingtousethe
virtualmachinefromthatpoint,takinganothersnapshotatalaterpoint,andsoon.
Eachsnapshotisarestorationpointinasinglelongsequence.
Figure 9-1. Snapshots as Restoration Points in a Linear Process
Workstationsupportsmorethan100snapshotsforeachlinearprocess.
Usesnapshotsinalinear
processforthefollowingsitu ations:
Youplantomakeriskychangesinavirtualmachine,suchasbytestingnew
softwareorexaminingavirus.Beforeaddingnew,untestedcodetoaproject,take
asnapshot.
Youcanalwaysreverttoapreviousknownworkingstateoftheprojectifthenew
codedoesnotworkasexpected
.Ifthenewcodecausesnoproblems,youcantake
anothersnapshotofthevirtualmachineinitsnewstate.
Youcreateatrainingcourseandwanttosavethestateofthevirtualmachineina
snapshotateachlesson’sstartingpoint.Youcanusethesnapshotstoskiplengthy
computerpreparationtime.
Youcanalsoconfigurethevirtualmachinetoreverttoasnapshotanytimeitis
poweredoff.Eachtimeane
wclassbeginsalesson,thepreviousstudent’sworkis
discarded.See“RevertatPowerOff”onpage 211.
N
OTEYoucanconfigureavirtualmachinetotakeasnapshotanytimeitis
poweredoff,preservingavirtualaudittrailasworkprogresses.See“Takeor
ReverttoaSnapshotatPowerOff”onpage 213.
lesson 1Windows
operating system
lesson 2 lesson 3 lesson 4 lesson 5
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