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Removal and replacement procedures 59
o
If the server has failed, remove the controller, cache module ("Removing the BBWC cache module"
on page 56), and battery pack ("Removing the BBWC battery pack" on page 57) 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.
Flash-backed write cache procedures
Two types of procedures are provided for the FBWC option:
• Removal and replacement of failed components:
o Removing the cache module ("Removing the FBWC cache module" on page 59)
o Removing the capacitor pack ("Removing the FBWC capacitor pack" on page 60)
• Recovery of cached data from a failed server ("Recovering data from the battery-backed write cache"
on page 58)
CAUTION: Do not detach the cable that connects the battery pack or capacitor pack to the cache
module. Detaching the cable causes any unsaved data in the cache module to be lost.
Removing the FBWC cache module
CAUTION: After the server is powered down, wait 15 seconds and then check the amber LED
before unplugging the cable from the cache module. If the amber LED blinks after 15 seconds, do
not remove the cable from the cache module. The cache module is backing up data, and data is
lost if the cable is detached.
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.
To remove the component:
1. Power down the server (on page 26).
2. Extend the server from the rack (on page 26).
3. Remove the access panel (on page 28).
4. If the existing cache module is connected to a capacitor pack, observe the FBWC module LEDs (on
page 87):
o If the amber LED is flashing, data is trapped in the cache. Restore system power, and then restart this
procedure from step 1.
o If the amber LED is not illuminated, remove the controller from the server, and then continue with the
next step.