LSI 3ware SAS 9750-8i Betriebsanweisung PDF herunterladen (Seite 123)

Setting Unit Policies

www.lsi.com/channel/products 111

Figure 54. Unit Write Cache State in 3BM

The current setting—Enabled or Disabled—is shown. (The initial default

setting is for write cache to be enabled.)

5 Press

Enter to display the choices, use the arrow keys to select the

setting you want, and press

Enter again to choose it.

6Tab to the

OK button and press Enter to select it.

You return to the main 3BM screen.

7 When you are finished making changes, press

F8 to save them and exit

3BM.

Working with Read Cache Settings

The Read Cache unit policy lets you enable either Basic Read Caching or

Intelligent Read Caching. You can also disable the Read Cache unit policy, if

preferred.

By default, Read Cache is set to

Intelligent. You can change it to Basic or to

Disabled, as appropriate.

About the Read Cache Basic and Intelligent Modes

Basic Mode is used to store read cache data locally on the controller that has

recently been written to media and is likely to be frequently accessed. This

improves read access times for applications such as a database that can take

advantage of storage caching. The read cache may be disabled without

reducing performance for applications that are write intensive, or that rarely

read back data recently written.

Intelligent Mode enables the Intelligent Read Prefetch (IRP) feature.

The Intelligent Read Prefetch feature includes a typical read-ahead caching

method which is used to proactively retrieve data from media and store it

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LSI 3ware SAS 9750-8i Betriebsanweisung Seite 123