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Chapter 10 Creating Virtual Machines

Mapping a SAN LUN

ForvirtualmachinesrunningonanESXServerhost,insteadofstoringvirtualmachine

datainavirtualdiskfile,youcanstorethedatadirectlyonaSANLUN.Thisisuseful

ifyouarerunningapplicationsinyourvirtualmachinesthatmustknowthephysical

characteristicsofthestorage

device.

WhenyoumapaLUNtoaVMFSvolume,VirtualCentercreatesafilethatpointstothe

rawLUN.EncapsulatingdiskinformationinafileallowsVirtualCentertolockthe

LUNsothatonlyonevirtualmachinecanwritetoit.

To map a SAN LUN

1FromtheSelectaDiskpage,selectMapped

SANLUN.

2ClickNext.

3 SelectaLUNfortherawdisk.

4ClickNext.

5 SelectadatastoreontowhichtomaptheLUN.

6ClickNext.

7 Selectacompatibilitymode,eitherphysicalorvirtual.

 Physicalcompatibilitymodeallowstheguestoperatingsystemtoaccessthe

hardwaredirectly.PhysicalcompatibilityisusefulifyouareusingSAN‐aware

applicationsinthevirtualmachine.However,aLUNconfiguredforphysical

compatibilitycannotbecloned,madeintoatemplate,ormigratedifthe

migrationinvolvescopyingthedisk.



 VirtualcompatibilitymodeallowsthevirtualmachinetouseVMware

snapshotsandotheradvancedfunctionality.Virtualcompatibilityallowsthe

LUNtobehaveasifitwereavirtualdisk,soyoucanusefeatureslikedisk

modes.Whenyouclonethedisk,makeatemplateoutofit,ormigrateit

(ifthe

migrationinvolvescopyingthedisk),thecontentsoftheLUNarecopiedinto

avirtualdisk(.vmdk)file.

Subsequentscreensofferdifferentoptions,dependingonyourchoice.

OTEThisfilehasa.vmdkextension,butthefilecontainsonlydiskinformation

describingthemappingtotheLUNontheESXServersystem.Theactualdataisstored

ontheLUN.

YoucannotdeployavirtualmachinefromatemplateandstoreitsdataonaLUN;you

canonly

storeitsdatainavirtualdiskfile.

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ESX QE450.2 Spécifications Page 153