Specifications

1
Shelf Management Overview
16
Management controllers (IPMCs and MMCs)
EachintelligentFRUincludesamanagementcontroller,eitheranIntelligentPlatform
ManagementController(IPMC)oraModuleManagementController(MMC).MostFRUsuse
IPMCs;however,AMCsandintelligentRTMsuseMMCsinstead.IPMCsandMMCsmanage
FRUresourcessuchassensorsandcontrols.
IPMCsarethefirstshelfcomponentstobepoweredup,allowingthemtocontrolpowerto
theresourcestheymanage.AnIPMCcanpoweroffafunctionalblockthatisfailingorthatthe
ShelfManagerinstructstopoweroff.TheIPMCalsogatherssensordataandcommunicates
overtheIPMB.
MMCsperformmanyofthesamefunctionsasIPMCs,includinggatheringsensordata and
providingaccesstotheAMCFRUinventorydata.TheMMCcommunicateswithacarrier
module’sIPMCovertheIPMB‐L.Afterthecarrierispoweredandfullyactive,thepayloadof
eachAMCispoweredupsoitcancontrolpowertotherestoftheAMC.TheAMCsare
poweredupinorderofsitenumber,fromlowesttohighest.Whenacarriermoduleis
extractedaccordingtoproperprocedure,theAMCsitesareshutdowninthereverseorder
thattheywereactivated(lastsitefirst).Thenthecarriermoduleisshutdownandcanbe
safelyremoved.
Sensor data records (SDRs)
Sensordatarecords(SDRs)controlaccesstoanIPMC’sorMMC’smanagedFRUresources,
includingallsensorsandFRUinformation.TheShelfManagerandsystemmanagerhave
knowledgeonlyofsensorsdescribedbySDRs,andtheygainaccesstothemusingDeviceSDR
commandstoquerySDRsovertheIPMB‐0interface.
Non-volatile information storage
EachintelligentFRUstoresinformationaboutitselfinnon‐volatilestorage.Thestored
informationincludes:
•Serialnumber
•Partnumber
• Manufacturer
•Dateandtimeofmanufacture
• Productname
•EC/revisionlevel(whereECisanabbreviationforengineeringchange)
•FRUcapabilities
•Point‐to‐pointconnectivityrecordsformodulesthatplugintothebackplane(whichare
usedfor
electronickeying)
Non‐intelligentFRUsdepend onaproxyFRUtostorethisinformation.InthiscaseaproxyFRU
makestheinformationavailabletotheShelf Manager.