Apple Xserve RAID: Using RAID 1.2 Admin and Disk Utility User Manual
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Chapter 3
Monitoring Status and Changing Settings
To set up drive cache and controller cache:
1
Open RAID Admin and click Settings.
2
If necessary, enter the management password and click OK.
3
Click the Performance button.
4
To set up drive cache, click checkbox for the array for which you want to enable or
disable the drive cache.
5
To set up controller cache, click the button you want for Write Cache and Read Prefetch
for each controller.
•
Write Cache is used to complete data transactions from the host computer before
actually writing the data to the drives.
•
Read Prefetch anticipates that data should be retrieved from the arrays in sequential
order and “reads ahead.” In general, a large Read Prefetch setting is recommended
for video playback, and a small Read Prefetch setting is recommended for database
applications. Tuning the Read Prefetch setting may be required for optimal
performance, depending on your actual data.
6
Click OK.
7
In the confirmation window that appears, click OK.
Note: Drive cache and controller write cache are required for applications that have a
very high throughput, such as high-resolution video editing. UPS backup for drive
cache is highly recommended.