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Chapter 6 View Composer

Averyaggressivelevelofstorageovercommitresultsinarelativelysmallamountof

spacebeingreservedfordeltadiskexpansion;however,administratorscanaddalotof

extravirtualmachinestothedatastoreiftheypredictthatthedeltadisksofeachvirtual

machinewillnevergrowtotheirmaximum

possiblesize.

Whileahighovercommitlevelmaybeoptimalforcreatingalargenumberofvirtual

machines,adesktoppoolofthistypealsodemandsmoreattentionfromthe

administratorinordertoensurethattheremainingdiskspaceisnotcompletely

consumedbyvirtualmachineexpansion.Thisconditioncan

bepreventedby

periodicallyrefreshingorrebalancingthedesktoppoolandreducingthesizeofthe

operatingsystemdatatoitsbaselinelevel.

Toaddressdifferentlev elsofthrough putoneachdatastore,youcanvarystorage

overcommitlev elsbetweendifferenttypesofdatastores(forexample,NASversusSAN).

Storageovercommitapplies

onlytodeltadisks.Itdoesnotapplytouserdisksor

standard(non‐linked)clones.

Desktop Recomposition

InFigure 6‐2adesktopcloneislinkedtoreplica1,whichitselfisacopyofParent VM 1.

Arecompositionactionisinitiatedwhentheadministratorselectsadifferentsnapshot

inthesameParentVMordifferentParentVM(asinthisexample).Ineithercaseanew

replicaisprovisioned.

Figure 6-2. Desktop Recomposition

base image + snapshot

bloated

OS data disk

refreshed

OS data disk

user data disk

replica 2—

new base image

after recomposition

replica 1

parent VM 1

base image + snapshot

parent VM 2

recompose

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Q-See Remote Client Software V 4.0.1 Spezifikationen Seite 131