Lenovo System x3550 M4 - Memory Rank Sparing; Installing a Memory Module

Memoryranksparing
Thememoryranksparingfeaturedisablesthefailedmemoryfromthesystemconfigurationandactivatesa
ranksparingDIMMtoreplacethefailedactiveDIMM.
YoucanenableranksparingmemoryintheSetuputility,selectSystemSettings➙Memory.Formore
information,see“UsingtheSetuputility”onpage97
.
Themaximumavailablememoryisreducedwhenmemoryranksparingmodeisenabled.
ThefollowingdiagramliststheDIMMconnectorsoneachmemorychannel.
Figure37.Connectorsoneachmemorychannel
Followtheinstallationsequenceforranksparingmode:
•Installatleastonequad-rankDIMMinachannel.
•Installatleasttwosingle-rankordual-rankDIMMsinachannel.
Table8.MemoryranksparingmodeDIMMpopulationsequence
NumberofDIMMs
Numberofinstalled
microprocessorDIMMconnector
FirstpairofDIMMs
11,2
SecondpairofDIMMs
14,5
ThirdpairofDIMMs
18,9
FourthpairofDIMMs
111,12
FifthpairofDIMMs
17,10
SixthpairofDIMMs
13,6
SeventhpairofDIMMs
213,14
EighthpairofDIMMs
216,17
NinthpairofDIMMs
220,21
TenthpairofDIMMs
223,24
EleventhpairofDIMMs
219,22
TwelfthpairofDIMMs
215,18
DIMMconnectors3,6,7,10,15,18,19,and22arenotusedinmemoryranksparingmodewhenUDIMMsare
installedintheserver.
Installingamemorymodule
Usethisinformationtoinstallamemorymodule.
50Systemx3550M4InstallationandServiceGuide