Recovering Data From The Flash-Backed Write Cache - HP ProLiant DL580 Gen9 Maintenance And Service Manual

Remove the capacitor pack.
10.
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
Perform one of the following:
1.
Set up a recovery server using an identical server model. Do not install any internal drives or
o
FBWC in this server. (Hewlett Packard Enterprise recommends this option.)
Find a server that has enough empty drive bays to accommodate all the drives from the failed
o
server and that meets all the other requirements for drive and array migration.
Power down the failed server
2.
Transfer the drives from the failed server to the recovery server.
3.
Perform one of the following:
4.
If the array controller has failed, remove the cache module and capacitor pack from the failed
o
array controller, and install the cache module and capacitor pack on an identical array controller
model in the recovery server.
If the server has failed, remove the controller, cache module, and capacitor pack from the failed
o
server, and install the controller, cache module, and capacitor pack in the recovery server.
Power up the recovery server. If there was data in the cache at the time of the controller or server
5.
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.
If the drives are migrated to different drive positions or there are volumes present in the recovery
server, a 1724 POST message appears, stating that logical drive configuration has been updated
automatically.
("Preventing electrostatic
("Power down the server" on page 26).
discharge" on page 25).
Removal and replacement procedures 48