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Memorymoduleinstallationorderinsparingmode
Thissectionexplainsthememorymoduleinstallationorderinsparingmode.Thesparingmodeprovides
memoryredundancy.Inthismode,theRASfeaturesareavailable.FormoreinformationabouttheRAS
features,refertotherelatedsectionin“Features”onpage7
.
Note:Itisrecommendedthatallmemorymodulestobeinstalledmustbethesametype(LVRDIMM,
RDIMM,orUDIMM)withthesamecapacity,frequency,voltage,andnumberofranks.
Yourserversupportsranksparingmode.Inranksparingmode,onerankofamemorymoduleworksasthe
sparerankfortheotherranksonthesamechannel.Thesparerankisnotavailableassystemmemory.To
enableranksparingmode,ensurethat:
Atleastthreeranksareavailableinonechannel.
Thecapacityofthesparerankmustbethesamewithorlargerthanthecapacityofotherrankswithin
thesamechannel.
Thefollowingtableexplainsthememorymoduleinstallationorderforserversthathaveonlyone
microprocessor(CPU1)installed.
Table11.Memorymoduleinstallationorderinsparingmodeforserverswithonemicroprocessor
CPU1DIMM
A1A2B1B2
C1C2
DIMMinstallationorder1234
5
6
Thefollowingtableexplainsthememorymoduleinstallationorderforserversthathavetwomicroprocessors
(CPU1andCPU2)installed.
Table12.Memorymoduleinstallationorderinsparingmodeforserverswithtwomicroprocessors
CPU1DIMMCPU2DIMM
A1A2B1B2
C1C2
D1D2E1E2F1F2
DIMMinstallationorder12
5
691034
7
81112
Memorymoduleinstallationorderinlockstepmode
Thissectionexplainsthememorymoduleinstallationorderinlockstepmode.Inthismode,theRASfeatures
areavailable.FormoreinformationabouttheRASfeatures,refertotherelatedsectionin“Features”on
page7.
Notes:
Inthismode,slotsA1andA2cannotbepopulated.
Inthismode,slotsB1andB2mustbepopulatedidenticallyasslotsC1andC2.
Allmemorymodulestobeinstalledonaservermustbethesametype(LVRDIMM,RDIMM,orUDIMM)
withthesamecapacity,frequency,voltage,andnumberofranks.
Thefollowingtableexplainsthememorymoduleinstallationorderforserversthathaveonlyone
microprocessor(CPU1)installed.
Table13.Memorymoduleinstallationorderinlockstepmodeforserverswithonemicroprocessor
CPU1DIMM
A1A2B1B2
C1C2
DIMMinstallationorder1324
Chapter6.Installing,removing,orreplacinghardware97
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