Lenovo ThinkServer RD450 - Page 91

Memorymoduleinstallationorderinmirroringmode
Inmirroringmode,theservermaintainstwoidenticalcopiesofalldatainmemoryandtheRASfeaturesare
available.FormoreinformationabouttheRASfeatures,refertotherelatedsectionin“Features”onpage7.
Notes:
•Allmemorymodulestobeinstalledmustbethesametypewiththesamecapacity,frequency,voltage,
andnumberofranks.
•Allmemorymodulesmustbeinstalledinpairs.
Thefollowingtableexplainsthememorymoduleinstallationorderforserversthathaveonlyone
microprocessor(CPU1)installed.
Table5.Memorymoduleinstallationorderinmirroringmodeforserverswithonemicroprocessor
CPU1DIMM
A1A2B1B2
C1C2
D1D2
DIMMinstallationorder13132424
Thefollowingtableexplainsthememorymoduleinstallationorderforserversthathavetwomicroprocessors
(CPU1andCPU2)installed.
Table6.Memorymoduleinstallationorderinmirroringmodeforserverswithtwomicroprocessors
CPU1DIMMCPU2DIMM
A1A2B1B2
C1C2
D1D2A1A2B1B2
C1C2
D1D2
DIMMinstallationorder1
5
1
5
3
7
3
7
26264848
Memorymoduleinstallationorderinsparingmode
Thesparingmodeprovidesmemoryredundancy.Inthismode,theRASfeaturesareavailable.Formore
informationabouttheRASfeatures,refertotherelatedsectionin“Features”onpage7.
Note:Allmemorymodulestobeinstalledmustbethesametypewiththesamecapacity,frequency,
voltage,andnumberofranks.
Yourserversupportsranksparingmode.Inranksparingmode,onerankofamemorymoduleworksasthe
sparerankfortheotherranksonthesamechannel.Thesparerankisnotavailableassystemmemory.To
enableranksparingmode,ensurethat:
•Atleastthreeranksareavailableinonechannel.
•Atleasttwomemorymodulesareinstalledinonechannel.
Thefollowingtableexplainsthememorymoduleinstallationorderforserversthathaveonlyone
microprocessor(CPU1)installed.
Table7.Memorymoduleinstallationorderinsparingmodeforserverswithonemicroprocessor
CPU1DIMM
A1A2B1B2
C1C2
D1D2
DIMMinstallationorder11223344
Chapter6.Replacinghardware77