Removal and replacement procedures 50
o
If the array controller has failed, remove the cache module ("Removing the cache module" on page
48) and battery pack ("Removing the battery pack" on page 49) 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 ("Half-length expansion board" on page 46,
"Full-length expansion board" on page 47), cache module ("Removing the cache module" on page
48), and battery pack ("Removing the battery pack" on page 49) 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
o Removing the capacitor pack ("Flash-backed write cache capacitor pack" on page 51)
• Recovery of cached data from a failed server ("Recovering data from the battery-backed write cache"
on page 49)
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.
Flash-backed write cache module
To remove the component:
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 down the server (on page 26).
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. Extend the server from the rack (on page 27).
5. Remove the access panel ("Access panel" on page 33).
6. Remove the PCI riser cage ("PCI riser cage" on page 43)
7. If the existing cache module is connected to a capacitor pack, observe the FBWC module LEDs (on
page 95):
o If the amber LED is flashing, data is trapped in the cache. Restore system power, and restart this
procedure from step 1.
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