A technician correctly powers off and replaces a cache battery on a RAID controller. When the server is powered back up, it restarts but indicates there are no logical disk volumes found. The server…

RAID controllers with write-back cache depend on battery-backed write cache (BBWC) to protect data integrity. If the replacement battery is not properly seated, is faulty, or requires a charge cycle before being recognized, the controller may enter a fault or learning state and refuse to expose logical volumes to the OS to prevent data corruption. Verifying the battery is correctly installed and recognized by the controller firmware is the first check.

BIOS boot order affects which device the system attempts to boot from, but the error indicates no logical volumes are detected at the controller level - a layer below BIOS boot sequence.

Controller cabling is a valid hardware check, but since the server was functioning before only the battery was swapped, the most directly implicated component is the newly replaced battery.

The disk backplane connects physical drives to the controller; since only the cache battery was touched and no drives were physically moved, the backplane is an unlikely cause without additional symptoms.