Changing the Logical Drive Cache Settings

Use the Change Cache Settings option to specify the settings for a single logical drive or for multiple logical drives on a storage subsystem.

Keep these guidelines in mind when you change cache settings for a logical drive:

  1. In the Logical pane, select a logical drive, and select Logical Drive >>Change >> Cache Settings .
  2. To modify multiple logical drives, select the logical drives in the Select logical drives area.To select nonadjacent logical drives, press Ctrl+click. To select adjacent logical drives, press Shift+click. To select all of the available logical drives, click Select All.
  3. To enable read caching, select the Enable read caching check box.
  4. To set the cache read-ahead value, select or type a value in the Cache read-ahead multiplier spinner box.
  5. To enable write caching, select the Enable write caching check box.
  6. Select one of these options:


    Attention:

    Possible loss of data – Selecting the Enable write caching without batteries option lets write caching continue even when the batteries are discharged completely or not fully charged. Typically, write caching is turned off temporarily by the controller until the batteries are charged. If you select this option and do not have a universal power supply for protection, you could lose data. In addition, you could lose data if you do not have controller batteries and you select the Enable write caching without batteries option.


    Important:

    When the Optional controller batteries option is enabled, the Enable write caching check box does not appear. The Enable write caching without batteries check box is still available, but it is not checked by default.


    Note:

    Cache is automatically flushed after the Enable write caching check box is disabled.

  7. Click OK.
  8. In the confirmation dialog, click Yes.
    A progress dialog appears, which indicates the number of logical drives being changed. To stop any further logical drives from being changed, click Cancel.
  9. To close the dialog, click OK.

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