HP Integrity rx2800 rx2800 i2 User Service Guide - Page 116

Recovering data from the battery-backed write cache, controller in the recovery server.

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To replace the component, reverse the removal procedure. Recovering data from the battery-backed write cache If the server fails, use the following procedure to recover data temporarily stored in the BBWC. CAUTION: Before starting this procedure, read the information about protecting against electrostatic discharge ("Preventing electrostatic discharge" (page 97)). 1. Perform one of the following: • Set up a recovery server station using an identical server model. Do not install any internal drives or BBWC in this server. (HP recommends this option.) • Find a server that has enough empty drive bays to accommodate all the drives from the failed server and that meets all the other requirements for drive and array migration. 2. power off the failed server ("power off the server" (page 102)). 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: • If the array controller has failed, remove the cache module and battery pack from the failed array controller, and install the cache module and battery pack on an array controller in the recovery server. • If the server has failed, remove the controller (Half-length expansion board ("Half-length expansion board" (page 112)), Full-length expansion board ("Full-length expansion board" (page 113))), cache module, and battery pack 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. 116 Removal and replacement procedures

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To replace the component, reverse the removal procedure.
Recovering data from the battery-backed write cache
If the server fails, use the following procedure to recover data temporarily stored in the BBWC.
CAUTION:
Before starting this procedure, read the information about protecting against
electrostatic discharge (
“Preventing electrostatic discharge” (page 97)
).
1.
Perform one of the following:
•
Set up a recovery server station using an identical server model. Do not install any internal
drives or BBWC in this server. (HP recommends this option.)
•
Find a server that has enough empty drive bays to accommodate all the drives from the
failed server and that meets all the other requirements for drive and array migration.
2.
power off the failed server (
“power off the server” (page 102)
). 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:
•
If the array controller has failed, remove the cache module and battery pack from the
failed array controller, and install the cache module and battery pack on an array
controller in the recovery server.
•
If the server has failed, remove the controller (Half-length expansion board (
“Half-length
expansion board” (page 112)
), Full-length expansion board (
“Full-length expansion board”
(page 113)
)), cache module, and battery pack 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.
116
Removal and replacement procedures