Removal and replacement procedures 46
2.
Power down the failed server ("Power down the server" on page 25). If any data is stored in the
cache module, a green LED on the module flashes every 2 seconds.
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.
3. Transfer the hard drives from the failed server to the recovery server station.
4. Perform one of the following:
o If the array controller has failed, remove the cache module (on page 43) and battery pack
("Cache battery" on page 44) 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 (on page 43), and battery pack
("Cache battery" on page 44) 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 ("Flash-backed write cache module" on page 46)
o Removing the capacitor pack ("Flash-backed write cache capacitor pack" on page 48)
• Recovery of cached data from a failed server ("Recovering data from the battery-backed write
cache" on page 45)
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 25).
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.
5. Remove the access panel ("Access panel" on page 28).
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