Removal and replacement procedures 45
o
Double capacitor pack holder:
To replace the component, reverse the removal procedure.
Recovering data from the flash-backed write cache
If the server fails, use the following procedure to recover data temporarily stored in the FBWC.
CAUTION: Before starting this procedure, read the information about protecting against
electrostatic discharge ("Preventing electrostatic discharge" on page 23).
1. Perform one of the following:
o Set up a recovery server using an identical server model. Do not install any internal drives or FBWC
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 25).
3. Transfer the drives from the failed server to the recovery server.
4. Perform one of the following:
o If the array controller has failed, remove the cache module ("Flash-backed write cache module" on
page 41) and capacitor pack ("Flash-backed write cache capacitor pack" on page 43) from the
failed array controller, and install the cache module and capacitor pack on an identical array
controller model in the recovery server.
o If the server has failed, remove the controller ("Half-length expansion board" on page 47), cache
module ("Flash-backed write cache module" on page 41), and capacitor pack ("Flash-backed write
cache capacitor pack" on page 43) from the failed server, and install the controller, cache module,
and capacitor pack in the recovery server.
5. Power up the recovery server. If there was data in the cache at the time of the controller or server failure,
a 1792 POST message appears, 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 is
used) to another server.
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