HP ProLiant BL45p Server series - Manual (Page 41)

Hardware options installation 41
4. Refer to the label on the FC adapter to verify compatibility with the server
blade.
5. Install the FC adapter.
Smart Array 6i Battery-Backed Write Cache Enabler
option
The optional BBWC enabler provides the system with a means for storing and
saving data in the event of an unexpected system shutdown.