Backup Battery Unit (BBU) / Backup Battery Module (BBM)
The Backup Battery Unit (BBU) and the Backup Battery Module (BBM) define the battery of a RAID-controler that protects the writing cache from power cuts. The BBU is more and more replaced by a flash module with compensator. In case of a power failure, the content of the RAM-storage is written on the Flash-Modul which leads to a prolongation of the bridge time. The condensator copies the data pool without having to secure the power supply. Thus, the entire system is nearly maintenance-free.