Apple Xserve RAID User's guide Technical Information download pdf (Page 33)

Monitoring Status and Adjusting Settings 33

3 Click the Performance tab.

4 To set up drive cache, click buttons 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.

m Write Cache is used to complete data transactions from the host computer before actually

writing the data to the drives.

m Read Prefetch anticipates that data should be retrieved from the arrays in sequential order

and “reads ahead.” A large Read Prefetch is recommended for video playback; a small

Read Prefetch is recommended for database applications.

6 Click Apply Now.

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.

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Apple Xserve RAID User's guide Technical Information Page 33