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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Battery-Backup Cache
Battery-Backup Cache
The Battery-Backup Cache can be installed on IBM
ServeRAID II and 3H Adapters. The Battery-Backup Cache does not disable
the cache memory SIMM already attached to the IBM ServeRAID II Adapter,
nor is the memory capacity increased by its installation.
The Battery-Backup Cache mirrors only the dirty data in the SIMM. Dirty data
is data that is stored in the memory SIMM that has not been written to
the hard drives. In write-back mode the ServeRAID II Adapter notifies
the host that it has completed the write operation even though the data
hasn't yet been written to the hard drive.
An adapter with 32 MB of cache memory can use either an 8 MB or a 32 MB
Battery-Backup Cache. However, a 32 MB Battery-Backup Cache will provide
better performance.
While write-back mode improves performance, dirty data is in jeopardy of
being lost in the event of a system malfunction or power loss.
If a ServeRAID adapter/controller equipped with a Battery-Backup Cache
fails, it can be removed and installed on a working adapter. The data on
that Battery-Backup Cache can then be flushed into the memory SIMM
located on the new adapter and written to the disk.
More INFORMATION / HELP is available at the IBM-HelpCenter
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.