Cache Memory
Cache Memory holds the write-cache modules that plug onto RAID controllers. HP Smart Array battery-backed (BBWC) and flash-backed (FBWC) modules cover the P212, P410, P411, P400, P400i, E200i, 641, 642 and 5300 series, with P-Series and B-Series FBWC kits from 512MB to 1GB. There's Dell PERC 5/i cache for the PowerEdge 1950 and 2950 and a 4GB cache module for HP StorageWorks XP arrays. Without a working cache module, or with a failed battery or capacitor, these controllers turn off write caching and writes slow down noticeably.
