RAID Maintenance Free Backup Basic Functionality (RMFBU)

RAIDMaintenanceFreeBackupBasicFunctionality
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ARAIDMaintenanceFreeBackupUnitprotectstheintegrityofthecacheddataonIntel®RAIDModules
andIntel®RAIDcontrollers thathaveoncontroller memoryandsupportwritebackcachingwhichallows 
offloadingdatastoredintheRAMcachetotheNAND
flashifthereisacompleteACpowerfailureora
briefpoweroutage.Furthermore,iteliminatestheneedforlithiumion(Li‐ion)ba tteriestraditionally
usedtoprotectDRAMcachememoryonPCIRAIDcontrollers.Thereforethisisagreenerandlowertotal
costcacheprotectionsolution.Super‐Capacitorhealth
ismonitoredbytheTFMwhichisthenreported
toraidcontrollerfirmware.Theraidcontrollerfirmwarewillinitiatealearncycleduringpoweronand
periodicallythereafter.ThelearncycleallowstheTFMtomeasurethesuper‐capacitorhealth.This
documenthasdescribedthefunctionoftheRMFBUand
theprocessthatallowstheraidcontroller
firmwaretomonitorandreportthehealthofthesuper‐capacitor.