Recovering Data From The Battery-Backed Write Cache; Flash-Backed Write Cache Procedures; Flash-Backed Write Cache Module - HP PROLIANT ML350 G6 Maintenance And Service Manual

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:
electrostatic discharge
Perform one of the following:
1.
Set up a recovery server station using an identical server model. Do not install any internal drives or
o
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
o
and that meets all the other requirements for drive and array migration.
Power down the failed server
2.
module, a green LED on the module flashes every 2 seconds.
CAUTION:
Detaching the cable causes any unsaved data in the cache module to be lost.
Transfer the hard drives from the failed server to the recovery server station.
3.
Perform one of the following:
4.
If the array controller has failed, remove the cache module
o
page 46) and battery pack
install the cache module and battery pack on an array controller in the recovery server.
If the server has failed, remove the controller, cache module
o
on page 46), and battery pack
install the controller, cache module, and battery pack in the recovery server.
Power up the recovery server. A 1759 POST message is displayed, stating that valid data was flushed
5.
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:
Removing the cache module
o
Removing the capacitor pack
o
•
Recovery of cached data from a failed server
on page 48)
CAUTION:
module. Detaching the cable causes any unsaved data in the cache module to be lost.

Flash-backed write cache module

To remove the component:
All manuals and user guides at all-guides.com
Before starting this procedure, read the information about protecting against
("Preventing electrostatic
("Power down the
Do not detach the cable that connects the battery pack to the cache module.
("BBWC battery
("BBWC battery
("Flash-backed write cache
("Flash-backed write cache capacitor
Do not detach the cable that connects the battery pack or capacitor pack to the cache
discharge" on page 28).
server" on page 27). If any data is stored in the cache
("Battery-backed write cache
pack" on page 47) from the failed array controller, and
("Battery-backed write cache
pack" on page 47) from the failed server, and
module" on page 48)
("Recovering data from the battery-backed write
Removal and replacement procedures 48
module" on
module"
pack" on page 50)
cache"