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Chapter 8 Consolidating the Datacenter

 Confidence–IndicatesthedegreetowhichVirtualCenterisabletogather

performancedataaboutthesystemandhowgoodacandidatethesystemisbased

ontheavailabledata.

 CPUUsage–Displaysthesystem’saverageCPUusage.

 MemoryUsage–Displaysthesystem’saveragememory.

Afterreviewinganalysisresults,youcanproceedbycreatingaconsolidationplan.See

“ConsolidatingCandidates”onpage 135.

About the Confidence Metric

OneimportantmetricdisplayedintheAnalysistabistheConfidencemetric.During

theanalysisphase,performancedataabouteachselectedsystemiscollected.Thisdata

iscomparedtohostresourcestodeterminearecommendationforeachcandidate.The

recommendationindicateshowwellsuited,basedonthecollecteddata,acandidate

is

toaparticularvirtualmachinehostsystem.Confidencereferstothereliabilityofthe

recommendationanditisafunctionofthedurationoftheanalysis.Recommendations

basedonlongerperiodsofanalysis–andthereforemoreperformancedata–receivea

higherlevelofconfidence.

Consolidating Candidates

Afteryouhaveanalyzedyourdatacenter,youarereadytoconvertcandidatestovirtual

machines.Inthisphase,youselectthesystemsyouwanttoconvert.VirtualCenter

selectsappropriatedestinationsandconfigurationparametersforeachresultantvirtual

machine.Ifmorethanonevirtualmachinehostisavailable,youcanselectthe

hostyou

want.

OTEAfter24hoursofanalysis,VirtualCenterindicatesahighlevelofconfidencein

itsrecommendations.However,thiscanbemisleadingifasystem’sworkloadvaries

significantlyoverweeksormonths.Toensureahighlevelofconfidenceina

recommendation,allowthedurationoftheanalysisphasetoencompassan

amountof

timethatincludesrepresentativepeaksandtroughsinthesystems’workload.Analysis

canrunuptoonemonth.

NOTEItishighlyrecommendedthatyouvirtualizeonecandidateatatime.

Consolidatingmultiplecandidatessimultaneouslycouldcauseallvirtualization

operationstofailifthehostdoesnotcontainanadequateamountofstoragespace.

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ESX QE450.2 Spezifikationen Seite 135