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Configuring array read-ahead and writeback cache
www.gateway.com
Normally, write-intensive operations will benefit through higher performance
when writeback cache is enabled on that array. Read-intensive operations, such
as a streaming server, may not benefit from writeback cache.
The writeback cache is used to optimize the write performance specific to your
data patterns. In general, larger cache sizes will increase the write performance
but can lower simultaneous read performance. The recommended size is 16 MB.
The strategy of write operations results in a completion signal being sent to
the host operating system as soon as the cache receives the data to be written.
The hard drives will receive the data at a more appropriate time in order to
increase controller performance.
Configuration Memory Vendor
and Part Number
Measured
Current
Draw
Absolute
Maximum
Backup Time
Expected
Safe
Backup
Time
Main board only
w/256 MB
Kingston
KVR100X72C2/
256
27.9mA 41.2 hours 20.6 hours
Main board
w/256 MB and
Coprocessor
w/256 MB
Kingston
KVR100X72C2/
256
48.3mA 23.8 hours 11.9 hours