Dell PowerEdge M1000e Carta bianca Scaricare il pdf (Pagina 9)

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Oncetheoperatingsystemisinstalled,youcaninstallapplicationsandusethesystemnormallywithafewcaveats.

Thereareapplicationsthatmaytrytointeractwiththeharddrivedirectly(imagingtools)–thesemaynotworkas

expected.Dellrecommendsthatyoucontactyourapplication

vendorsforallmission‐criticalapplicationsto

ensuretheyworkintheUEFIenvironment.

Limitations

ThissectionexplainspotentialproblemswhichmayoccurwhileinstallingaUEFI‐awareoperatingsystemandhow

toavoidthem.

LargeOperatingSystemPartitions

Anoperatingsysteminstallerreliesondiskcontrollerfirmwaretoperformdiskread/writefunctionspriortothe

diskdriverisavailable.Certainlegacydiskcontrollersuseolder

firmware(suchasInterrupt0x13handlers)to

executeread/writefunctionsinUEFImodeanddonotprovidenativeaccessdisksinUEFImode.TheUEFIlayer

providestheabstractiondrivertoaccessthedisksusingtheoldfirmware.Themostnotablerestrictionisthatthe

legacyinterrupt0x13functionsare

unabletoaccesslogicalblockaddresseshigherthan2terabytes(TB).Forthis

reason,Dellstronglyrecommendsusingapartitionorvirtualdisksmallerthan2TBforthepartitionwherethe

operatingsystemresides.Failuretouseapartitionsizeoflessthan2TBfortheoperatingsystemvirtualdiskmay



causeundesiredbehaviorandwilleliminatetheinherentGPTpartitionredundancy.Datapartitions(non‐system

partitions)canbelargerthan 2TBsincethediskdriverisavailablewhentheoperatingsystemaccessesthese

partitions.

ThirdPartyImagingUtilities

UEFIusesapartitioningschemeknownasaGPT.Thisschemeassigns

aGloballyUniqueIdentifier(GUID)toeach

partitioninadisk.Beawarethatimagingutilities(suchasNortonGhost)needtore‐createtheGPTinorderto

haveuniqueGUIDsforpartitionswhicharecopiedfromonedisktoanother.Otherwisedifferentdiskswillusethe

sameGUIDfor

multiplepartitions,whichmaycauseconflictsforsoftwarewhichusestheGUIDstodistinguisheach

partition.

TransferringHardDisks

UEFIBootOptionsarestoredinnon‐volatilememoryonasystem.Whenanoperatingsysteminstallerexecutes,it

createsabootoptionfortheoperatingsysteminthesystem’snon‐

volatilememory.Iftheharddiskwhich

containstheoperatingsystemisremovedandtransferredtoanothersystem,thisnewsystemwillnothavethe

bootoptioninitsnon‐volatilememory,andauserwillnotbeabletoboottotheoperatingsystem.

Dellhasaddressedthisproblemby

keepingacopyoftheoperatingsystembootoptionontheharddiskwiththe

operatingsystem.WhentheharddiskistransferredtoanotherDellsystem,thesystemusesthecopyofthe

operatingsystembootoptiontocreateabootoptioninitsnon‐volatilememory.Thisallows

ausertoboottothe

operatingsystem.Theprocessisautomatic;nouserinteractionisnecessarytocreatethebootoptiononthe

secondsystem.

UEFILegacyBootControllers

TheUEFIlayerprovidestheabstractiondrivertoaccessthedisksusingtheinterrupt0x13functions.Thefollowing

DellUEFILegacybootcontrollersoperateusinglegacyabstractionsupportedinUEFImode:

• DellPERC6/i

• DellSAS6/iR

FuturecontrollerswillprovidenativeUEFIdrivers.

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Dell PowerEdge M1000e Carta bianca Pagina 9

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