Determining If Data Is In The Cache; Recovering Data From The Cache - HP D7171A - NetServer - LPr Installation Manual

Hp netraid-4m installation guide
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Note:
If you suspect a hardware failure, contact your
technical support representative to determine the cause of
failure and to see if a replacement controller is required.
The following sections explain how to determine if data is in the
cache, and if data is present, how to retrieve it.

Determining if Data is in the Cache

To determine if there is data in the cache
1
Press the small push-button on the edge of the HP NetRAID-
4M Daughter Card to determine if the DIMM is still being
powered by the battery subsystem. (Under normal shutdown,
the controller flushes any cached data to disk and disconnects
the DIMM from the batteries.)
2
If the LED does not light, then the cache contains no valid data.
You can safely remove power to the HP NetRAID-4M
controller and/or Daughter Card without data loss.
3
If the LED does light, then the DIMM is still being powered by
the batteries, indicating that the cache may contain valid data.
Proceed with Recovering Data from the Cache.
Note:
The batteries on the Daughter Card, when fully
charged, are designed to maintain the cache memory for
holdover times that are specified in Appendix E,
Specifications. To maximize the protection of the cache,
however, you should maintain power to your HP NetRAID-
4M controller and Daughter Card by leaving the controller
plugged into a powered PCI slot. If doing so prevents you
from using this system, move your controller to another
system where you can maintain power until you have all of
the parts necessary to complete the repair.

Recovering Data from the Cache

To recover data in the cache the following steps must be followed.
These should be done by yourHewlett-Packard technical support
representative.
Understanding The Battery Subsystem
8-5

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