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Chapter 15 Migrating Virtual Machines

Migration

Thevirtualmachineyouwanttomigratemustbepoweredofforsuspendedpriorto

beginningthemigrationprocess.Withamigration,youalsohavetheoptionofmoving

theassociateddisksfromonedatastoretoanother.(Tomovethedisksofapowered‐on

virtualmachinefromonedatastoreto

another,useStorageVMotion.)Amigration

consistsofthefollowingsteps:

1Theconfigurationfiles,includingtheNVRAMfile(BIOSsettings),logfiles,and

thesuspendfileforsuspendedvirtualmachinesaswellasthedisksofthevirtual

machinearemovedfromthesourcehosttothedestinationhost’sassociated

storage

area.

2Thevirtualmachineisregisteredwiththenewhost.

3Afterthemigrationiscompleted,theoldversionofthevirtualmachineisdeleted

fromthesourcehost.

Iferrorsoccurduringmigration,thevirtualmachinesreverttotheiroriginalstatesand

locations.

Youcanmovevirtualmachinesmanuallyorsetup

ascheduledtasktoperformthe

migration.See“ManagingTasks,Events,andAlarms”onpage 297forinformationon

schedulingtasks.

Migration with VMotion

VMotionallowsworkingprocessestocontinuethroughoutamigrationwithVMotion.

Theentirestateofthevirtualmachineaswellasitsconfigurationfile,ifnecessary,are

movedtothenewhostevenwhilethedatastorageremainsinthesamelocationonthe

SAN.Theassociatedvirtualdiskremainsin

thesamelocationontheSANstoragethat

issharedbetweenthetwohosts.Aftertheconfigurationfileismigratedtothealternate

host,thevirtualmachinerunsonthenewhost.

Thestateinformationincludesthecurrentmemorycontentandalltheinformationthat

definesandidentifiesthevirtualmachine.

Thememorycontentincludestransaction

dataandwhateverbitsoftheoperatingsystemandapplicationsareinthememory.The

definingandidentificationinformationstoredinthestateincludesallthedatathat

mapstothevirtualmachinehardwareelements,suchasBIOS,devices,CPU,MAC

addressesfortheEthernet

cards,chipsetstates,registers,andsoforth.

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ESX QE450.2 Especificaciones Pagina 233