Removal and replacement procedures 55
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 28).
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 30). 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.
4. Perform one of the following:
o If the array controller has failed, remove the cache module ("Removing the cache module" on
page 53) and battery pack ("Removing the battery pack" on page 54) from the failed array
controller, and install the cache module and battery pack on an array controller in the recovery
server.
o If the server has failed, remove the controller ("Expansion board (slots 1 and 2)" on page 65),
cache module ("Removing the cache module" on page 53), and battery pack ("Removing the
battery pack" on page 54) from the failed server, and install the controller, cache module, and
battery pack in the recovery server.
5. Power up the recovery server. A 1759 POST message is displayed, stating that valid data was
flushed from the cache. This data is now stored on the drives in the recovery server. You can now
transfer the drives (and controller, if one was used) to another server.
Air baffle
Depending on the fan configuration, the air baffle is different. Use the following procedure for either
configuration.
To remove the component:
IMPORTANT: To maintain proper airflow and prevent thermal damage, always install the air
baffle.
1. Power down the server (on page 30).
2. Extend or remove the server from the rack ("Remove the server from the rack" on page 31).
3. Remove the access panel ("Access panel" on page 32).
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.
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