User guide

48 Configuring a Storage Solution
9. Set the Writeback Cache options.
Click the pull-down menu to select from Disabled, or choose one of the pre-determined cache
threshold sizes (1 MB, 2 MB, 4 MB, 8 MB, 16 MB, 32 MB, 64 MB, 128 MB, 256 MB or MAX
“MB”), see ”Configuring Array Writeback Cache” beginning on page 49.
There are three additional options to an active Writeback Cache:
Mirror Cache (Disable
Writeback Cache when partner controller fails or is missing), Disable Writeback Cache if a
controller battery is low or fails, and Disable Writeback Cache if array becomes critical (N/A
for RAID 0), (e.g., during a rebuild). Enable the options for your application. For maximum data
protection, it is recommended to enable all three options when applicable.
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 may 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 disk drives will receive the data at a more appropriate time in order
to increase controller performance.
10. Click the CREATE button to complete this operation.
11. You will see a confirmation message that the array was successfully created, click the CLOSE
button.
12. Click the CLOSE button at the bottom of the Create Array window.
Figure 28. Monitoring the Initialization Process at the Main Screen