A server is installed in a location that is prone to power failures. While the server is connected to a UPS, the systems administrator is still concerned about ensuring the integrity of the data…

Adding memory to the RAID controller increases cache capacity for performance but does not protect cached data from loss when power is suddenly removed.

Redundant RAID controllers provide failover for controller hardware failures but do not preserve write-cache data lost to a power outage.

RAID controllers use a write-back cache to buffer disk writes, which accelerates performance but risks data loss if power is cut before the cache is flushed to disk. A battery-backed write cache (BBWC) or flash-backed write cache (FBWC) module attached to the controller supplies enough power to flush all cached data to disk after an outage, ensuring no writes are lost. This directly addresses the administrator's concern about data integrity on the RAID array during power failures.

Updating firmware may fix bugs or add features but does not provide the physical backup power needed to protect cached writes during a power failure.