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5. Unlock the retaining clip (for full-length expansion boards).
6. Install the expansion board.
7. Lock the retaining clip (for full-length expansion boards) and close the latch.
8. Connect any required internal or external cables to the expansion board.
9. Replace the access panel (“Removing the access panel” (page 32)).
10. Slide the server into the rack.
11. Power up the server (“Power up the server” (page 31)).
Battery-backed write cache
The HP BBWC protects against hard boot, power, controller, and midplane board failures. The
server supports the following battery-backed options:
• 256-MB BBWC
• 512-MB BBWC
The BBWC consists of two parts: a battery pack and a storage cache module.
Along with the cache module, the battery pack provides transportable data protection, increases
overall controller performance, and maintains any cached data for up to 72 hours after the server
Battery-backed write cache 53