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Enable or Disable Write Caching—When write caching is
enabled, the controller stores the data in cache memory on the
controller and will accept another write to this array as soon as
the data from the previous write is safely stored in the
controller's memory.
Since writing data to memory is much faster than writing it to
the drives, enabling write caching can significantly improve
performance. All data stored in the cache will be written to the
drives when it is most efficient for the controller.
!
Caution: The default setting for write cache is enabled. This
setting provides the best performance, but in the event of
power failure there is a possibility of data loss.
Enable Or Disable Read Caching—When enabled, the
controller will monitor read accesses to this array to try to
predict where future reads may occur. If it detects a pattern, the
data that seems most likely to be read next is preloaded into the
controller's cache memory. Since reading data from memory on
the controller is much faster than reading it from the drives, this
significantly improves performance. The default is Enabled.
The Advanced area of the Create Array wizard may offer the
following additional options:
Limit Array Capacity—This option allows you to choose the
capacity of the array you are creating. The default is to make the
array the largest possible size with the drives selected. To create
multiple arrays on a single set of drives you must use this
option to limit the size of, at a minimum, the first array.
For example, if you have two 18-GB drives, and you wish to use
them to create two 9-GB RAID 1s, you would use this option to
restrict the size of the first array you create.
Note: The capacity of RAID 1 is limited to the capacity of the
smaller drive.
Using Adaptec Storage Manager – Browser Edition
5-13
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