HP Workstation xw6000 Adaptec SCSI RAID 2120S: Software User's Guide - Page 24

Enable when protected, Enable always, Disable

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Adaptec SCSI RAID 2120S/2200S Software User's Guide 4 Select the desired stripe size. The allowable stripe sizes are 16, 32, and 64 KB (the default). For RAID 50 arrays, 64 KB is the only stripe size supported by ACU. The default stripe size gives the best overall performance in most network environments. 5 Specify whether you want to enable read caching for the array. This option should always be enabled to optimize performance, unless your application is doing completely random reads, which is unlikely. 6 Specify if you want to enable write caching for the array. Note: By design, some controllers do not allow the use of write caching. In such cases, the controller will not activate write caching, regardless of the write cache setting. If this is the case a message will be displayed that tells you the settings have been recorded but have no effect. Write caching options (if supported) consist of the following: ■ Enable when protected-If supported, enables the write cache only when a battery is present and the battery's charge status is OK. ■ Enable always-If supported, enables the write cache even if no battery is present or the battery's charge status is not OK. Note that setting an array's write cache property to Enable always might result in data loss or corruption if power to the controller is lost when no battery is present or the battery loses its charge. ■ Disable-Disables use of the write cache. 7 When you are finished, press Done. 2-8

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2-8
Adaptec SCSI RAID 2120S/2200S Software User’s Guide
4
Select the desired stripe size. The allowable stripe sizes are 16,
32, and 64 KB (the default). For RAID 50 arrays, 64 KB is the
only stripe size supported by ACU. The default stripe size gives
the best overall performance in most network environments.
5
Specify whether you want to enable read caching for the array.
This option should always be enabled to optimize performance,
unless your application is doing completely random reads,
which is unlikely.
6
Specify if you want to enable write caching for the array.
Note:
By design, some controllers do not allow the use of
write caching. In such cases, the controller will not activate
write caching, regardless of the write cache setting. If this
is the case a message will be displayed that tells you the
settings have been recorded but have no effect.
Write caching options (if supported) consist of the following:
■
Enable when protected
—If supported, enables the write
cache only when a battery is present and the battery’s charge
status is OK.
■
Enable always
—If supported, enables the write cache even
if no battery is present or the battery’s charge status is not
OK. Note that setting an array’s write cache property to
Enable
always
might result in data loss or corruption if
power to the controller is lost when no battery is present or
the battery loses its charge.
■
Disable
—Disables use of the write cache.
7
When you are finished, press
Done
.