Lenovo x3550 M5 - Page 179

YoucanenableranksparingmemoryintheSetuputility,selectSystemSettings➙Memory.Formore
information,see“UsingtheSetuputility”onpage36
.
Themaximumavailablememoryisreducedwhenmemoryranksparingmodeisenabled.
ThememoryranksparingmoderequiresanevennumberofDIMMs.Ifyourserverhasanoddnumberof
DIMMsinstalled,ensurethatyoudisablethememoryranksparingmodefromtheMemorymenuinSetup
Utility.See“UsingtheSetuputility”onpage36.
Note:Afterdisablingthememoryranksparingmode,ifamessagepromptsthatthememoryconfigurationis
notvalid,restarttheIMM2.Alternatively,youcanturnofftheserver,disconnectitfromandthenreconnect
ittoacpower,andthenturnontheserveragain.
ThefollowingdiagramliststheDIMMconnectorsoneachmemorychannel.
Microprocessor 2
Microprocessor 1
Channel
CPU1
CPU2
Figure85.Connectorsoneachmemorychannel
Followtheinstallationsequenceforranksparingmode:
•Installatleastonequad-rankDIMMinachannel.
•Installatleasttwosingle-rankordual-rankDIMMsinachannel.
Table29.MemoryranksparingmodeDIMMpopulationsequencewhenonlyquad-rankRDIMMsareinstalled
Numberofinstalled
microprocessorDIMMconnectorpopulationsequenceonthesystemboard
One
1,4,9,12,2,5,8,11
Two1,13,4,16,9,21,12,24,2,14,5,17,8,20,11,23
Table30.MemoryranksparingmodeDIMMpopulationsequencewhensingle/dual/quadrankDIMMsareinstalledand
thetotalnumberofDIMMsiseven
DIMMs
Numberofinstalled
microprocessor
DIMMconnectorpopulation
sequenceonthesystemboard
OneMicroprocessor
1stset11,2
2ndset14,5
3rdset18,9
4thset111,12
5thset13,6
6thset17,10
TwoMicroprocessors
Chapter5.Removingandreplacingcomponents165