Removal and replacement procedures 52
o
If the array controller has failed, remove the cache module ("Removing the BBWC module" on page
46) and battery pack ("Removing the BBWC battery pack" on page 47) 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, cache module ("Removing the BBWC module" on
page 46), and battery pack ("Removing the BBWC battery pack" on page 47) 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.
FBWC procedures
• Removing and replacing failed components:
o Removing the FBWC module (on page 52)
o Removing the capacitor pack ("Removing the BBWC battery pack" on page 47)
o Installing the FBWC module and capacitor pack ("Installing the BBWC battery pack and cache
module" on page 48)
• Recovering cached data from a failed server ("Recovering data from the battery-backed write cache"
on page 51)
CAUTION: Do not detach the cable that connects the battery pack or capacitor pack to the cache
module. Detaching the cable causes all data in the cache module to be lost.
Removing the FBWC module
CAUTION: Do not use this controller with cache modules designed for other controller models,
because the controller can malfunction and you can lose data. Also, do not transfer this cache
module to a different controller module, because you can lose data.
1. Back up all data.
2. Close all applications.
3. Power off the server ("Power down the server" on page 23).
CAUTION: In systems that use external data storage, be sure that the server is the first unit to be
powered down and the last to be powered back up. Taking this precaution ensures that the system
does not erroneously mark the drives as failed when the server is powered up.
4. Remove the access panel ("Removing the access panel" on page 24).
5. Remove the air baffle ("Removing the air baffle" on page 26).
6. If the existing FBWC module is connected to a capacitor pack, observe the FBWC module LEDs (on
page 89):
o If the amber LED is flashing, data is trapped in the cache. Restore system power, and restart this
procedure.
o If the amber LED is not illuminated, remove the controller from the server, and then continue with the
next step.
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