Removal and replacement procedures 45
Removing the battery pack
To remove the component:
1. Power down the server (on page 26).
2. Extend or remove the server from the rack ("Remove the server from the rack" on page 27, "Extend the
server from the rack" on page 25).
3. Remove the access panel ("Access panel" on page 30).
4. Remove the PCI riser cage ("PCI riser cage" on page 38).
5. Disconnect the cable, and then remove the battery pack.
To replace the component, reverse the removal procedure.
Recovering data from the battery-backed write cache
If the server fails, use the following procedure to recover data temporarily stored in the BBWC.
CAUTION: Before starting this procedure, read the information about protecting against
electrostatic discharge ("Preventing electrostatic discharge" on page 24).
1. Perform one of the following:
o Set up a recovery server station using an identical server model. Do not install any internal drives or
BBWC in this server. (HP recommends this option.)
o Find a server that has enough empty drive bays to accommodate all the drives from the failed server
and that meets all the other requirements for drive and array migration.
2. Power down the failed server ("Power down the server" on page 26). If any data is stored in the cache
module, a green LED on the module flashes every 2 seconds.
CAUTION: Do not detach the cable that connects the battery pack to the cache module.
Detaching the cable causes any unsaved data in the cache module to be lost.
3. Transfer the hard drives from the failed server to the recovery server station.
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