Lenovo x3650 M5 - Memory Problems

Memoryproblems
Usethetroubleshootingtablestofindsolutionstoproblemsthathaveidentifiablesymptoms.
•FollowthesuggestedactionsintheorderinwhichtheyarelistedintheActioncolumnuntiltheproblemis
solved.
•Ifanactionstepisprecededby“(Trainedtechnicianonly),”thatstepmustbeperformedonlybyatrained
technician.
•Gotothesupportwebsiteathttp://www.lenovo.com/supporttocheckfortechnicalinformation,hints,tips,
andnewdevicedriversortosubmitarequestforinformation.
SymptomAction
Theamountofsystemmemory
thatisdisplayedislessthan
theamountofinstalledphysical
memory.
Note:EachtimeyouinstallorremoveaDIMM,youmustdisconnecttheserverfrom
thepowersource;then,wait10secondsbeforerestartingtheserver.
1.Makesurethat:
•NoerrorLEDsarelitontheoperatorinformationpanel.
•NoDIMMerrorLEDsarelitonthesystemboard.
•Memorymirroredchanneldoesnotaccountforthediscrepancy.
•Thememorymodulesareseatedcorrectly.
•Youhaveinstalledthecorrecttypeofmemory.
•Ifyouchangedthememory,youupdatedthememoryconfigurationinthe
Setuputility.
•Allbanksofmemoryareenabled.Theservermighthaveautomatically
disabledamemorybankwhenitdetectedaproblem,oramemorybank
mighthavebeenmanuallydisabled.
•Thereisnomemorymismatchwhentheserverisattheminimummemory
configuration.
2.ReseattheDIMMs,andthenrestarttheserver.
3.CheckthePOSTerrorlog:
•IfaDIMMwasdisabledbyasystems-managementinterrupt(SMI),replace
theDIMM.
•IfaDIMMwasdisabledbytheuserorbyPOST,reseattheDIMM;then,run
theSetuputilityandenabletheDIMM.
4.CheckthatallDIMMsareinitializedintheSetuputility;then,runmemory
diagnostics(see“RunningtheDSAPrebootdiagnosticprograms”onpage79).
5.ReversetheDIMMsbetweenthechannels(ofthesamemicroprocessor),and
thenrestarttheserver.IftheproblemisrelatedtoaDIMM,replacethefailing
DIMM.
6.Re-enableallDIMMsusingtheSetuputility,andthenrestarttheserver.
7.(Trainedtechnicianonly)InstallthefailingDIMMintoaDIMMconnector
formicroprocessor2(ifinstalled)toverifythattheproblemisnotthe
microprocessorortheDIMMconnector.
8.(Trainedtechnicianonly)Replacethesystemboard.
MultipleDIMMsinachannel
areidentifiedasfailing.
Note:EachtimeyouinstallorremoveaDIMM,youmustdisconnecttheserverfrom
thepowersource;then,wait10secondsbeforerestartingtheserver.
1.ReseattheDIMMs;then,restarttheserver.
2.Removethehighest-numberedDIMMofthosethatareidentifiedandreplace
itwithanidenticalknowngoodDIMM;then,restarttheserver.Repeatas
necessary.IfthefailurescontinueafterallidentifiedDIMMsarereplaced,go
tostep4.
86LenovoSystemx3650M5InstallationandServiceGuide