Q-See Remote Client Software V 4.0.1 Spécifications télécharger pdf (Page 129)

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Chapter 6 View Composer

ViewManageradministratorscansimultaneouslyupdate(orchange)theoperating

systemsofalllinkedclonedesktops,installorupdateclientapplications,ormodifythe

desktophardwaresettingsbycarryingouttheseactivitiesontheParentVMandthen

anchoringthelinkedclonestoanewsnapshotofthisconfiguration.Thisaction

iscalled

desktoprecomposition.

Administratorscanalsoreturntheoperatingsystemdataofeachlinkedclone

desktop—whichmayhaveexpandedthroughongoingusage—toitsoriginalstate

(that oftheParentVM)bycarryingoutanactioncalleddesktoprefresh.

InFigure 6‐1thedesktopuserdataisconfiguredtoresideona

separatedisk,soit

remainsunaffectedbydesktoprecompositionordesktoprefreshactions.Inthisway,

systemmodificationisdecoupledfromuserdatastorage.

ViewAdministratordeliversahigh‐leveloverviewofwhatactionsarebeingcarried

out.Policiescancontrolwhatactionsareexecutedandatwhattimeinorder

to

minimizedisruptiontotheuserbase.Connecteduserscanbenotifiedwithcustom

messagesifanupdatethatwillaffecttheirsessionisabouttotakeplace.

Linked Clone Desktop Disk Usage

Theinitialdiskusageofalinkedclonevirtualmachineisfarlowerthanthatofafull

clonebecausetheoperatingsystemandclientapplicationsarederivedfroma

Parent VM.Thegreatlyreducedstorageoverheadforoperatingsystemanduserdata

isaccomplishedthroughtheuseofdeltadisksand

thinprovisioning.

Everynewdesktopcreatedinastandard(non‐linkedclone)automatedpoolisa

duplicateofabasetemplate.Consequently,eachstandardcloneusesthesameamount

ofdiskspaceasthebasetemplatebecausetheoperatingsystemdataanduserdataof

thebasetemplateisreplicatedby

everyclonecreatedinthepool.

ViewComposergreatlyreducesthephysicalstorageoverheadoflinkedclonedesktop

poolsthroughuseofdeltadisks:abstractstoragemechanismswhoselogicalsizecanbe

greaterthantheirphysicalsize.Thindiskgrowthdependsonfactorsincluding

workload,power‐offpolicy,andpooltype.

Inalinkedclonedeployment,deltadisksareusedbythedesktoptostorethedata

differencebetweenitsownoperatingsystemandtheoperatingsystemofthe

Parent VMfromwhichitisderived.Immediatelyafterdeployment,thedifference

betweentheParentVMandeachofitslinkedclonesisextremely

small;therefore,the

deltadiskisalsoextremelysmall.

NOTELinkedclonescanalsobeanchoredtoanewsnapshotofacompletelydifferent

ParentVM.

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Q-See Remote Client Software V 4.0.1 Spécifications Page 129