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Chapter 15 Migrating Virtual Machines

processorsmustcomefromthesamevendorclass(IntelorAMD)andsameprocessor

family(P3,P4,orIntelcore)tobecompatibleformigrationwithVMotion.

ProcessorfamiliessuchasIntelXeonandAMDOpteronaredefinedbytheprocessor

vendors.

Youcandistinguishdifferentprocessorversionswithinthesamefamily

bycomparing

theprocessors’model,steppinglevel,andextendedfeatures:

 Inmostcases,differentprocessorversionswithinthesamefamilyaresimilar

enoughtomaintaincompatibility.

 Insomecases,processorvendorshaveintroducedsignificantarchitectural

changeswithinthesameprocessorfamily,suchastheSSE3andSSSE3instructions,

andNx/XDCPUsecurityfeatures.Bydefault,VMwareidentifiesmismatcheson

SSE3,SSSE3,andNx/XDasincompatibletoguaranteethestabilityofvirtual

machinesaftermigrationswithVMotion.

Server

hardware’sCPUspecificationswillusuallyindicatewhetherornottheCPUs

containtheSSE3,SSSE3,andNx/XDfeaturesthataffectVMotioncompatibility.Ifthe

specificationsofaserveroritsCPUfeaturesareunknown,VMware’sbootableCPU

identificationutility(availablefordownloadwithESXServer)canbeusedtoboota



serveranddeterminewhetheritsCPUscontainfeaturessuchasSSE3,SSSE3,and

NX/XD.

Nx/XD Considerations

 AMD’sNoeXecute(NX)andIntel’seXecuteDisable(XD)technologyservethe

samesecuritypurpose:tomarkmemorypagesasdata‐onlytopreventmalicious

softwareexploitsandbufferoverflowattacks.

 ThefollowingoperatingsystemssupportNXandXD:

WindowsServer2003(SP1),Windows*XP(SP2),WindowsVista,RHEL4,RHEL3

(Update3),SUSE10,SUSELinux9.2,Solaris10,Linuxkernels2.6.6orlater(or2.4

kernelswithapatch).

 InESXServer3.0,NXandXDtechnologyisexposedbydefaultforallguest

operatingsystemsthatcanuseit(tradingoffsomecompatibilityforsecurityby

default).HostspreviouslycompatibleinESXServer2.xmightbecome

incompatibleafterupgradingtoESXServer3.0ifNXmismatched,butper‐VM



CPUcompatibilitymasksspecifiedintheVMotionCPUCompatibilityMatrixcan

beusedtorestorecompatibility.

OTEVMware,inpartnershipwithCPUandhardwarevendors,isworkingto

maintainVMotioncompatibilityacrossthewidestrangeofprocessors.Foradditional

information,checktheVMwareKnowledgeBase.

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ESX QE450.2 Spezifikationen Seite 235