Lenovo System x3500 M5 Type 5464 - Page 165

Table23.Memoryproblemsandactions
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“RunningDSAPrebootdiagnosticprograms”onpage143).
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.
3.ReturntheremovedDIMMs,oneatatime,totheiroriginalconnectors,restarting
theserveraftereachDIMM,untilaDIMMfails.ReplaceeachfailingDIMM
withanidenticalknowngoodDIMM,restartingtheserveraftereachDIMM
replacement.Repeatstep3untilyouhavetestedallremovedDIMMs.
4.Replacethehighest-numberedDIMMofthoseidentified;then,restartthe
server.Repeatasnecessary.
5.ReversetheDIMMsbetweenthechannels(ofthesamemicroprocessor),and
thenrestarttheserver.IftheproblemisrelatedtoaDIMM,replacethefailing
DIMM.
Chapter4.Troubleshooting149