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Removal and replacement procedures 50
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 ("Flash-backed write cache module" on page 50)
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 27).
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. Do one of the following:
o Open or remove the tower bezel, as needed ("Front bezel" on page 30).
o Extend the server from the rack (on page 28).
5. Remove the access panel ("Access panel" on page 31).
6. If the existing cache module is connected to a capacitor pack, observe the FBWC module LEDs (on
page 92):
o If the amber LED is flashing, data is trapped in the cache. Restore system power, and 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.