Changing Storage Subsystem Cache Settings

Related Topics

Procedure

1

Select the storage subsystem from the Subsystem Management Window, then, select either the Storage Subsystem >> Change >> Cache Settings pull-down menu option, or Change >> Cache Settings from the right-mouse pop-up menu.

Result: The Cache Settings dialog is displayed.

2

Select the percentage of unwritten data in the cache that will trigger a cache flush in the Start flushing spinner box.

Note: A percentage that is too low increases the chance that data needed for a host read will not be in the cache. It also increases the number of disk writes necessary to maintain the cache level, increasing system overhead and decreasing performance.

3

Select the percentage of unwritten data in the cache that will stop a cache flush in progress in the Stop flushing spinner box.

Note: The lower the specified percentage, the higher the chance that data for a host read would require a disk read rather than be present in the cache.

4

Select a cache block size that is appropriate for your applications from the Cache block size drop-down list. Available choices include:

  • 4 KB (a good choice for file system or database application use)
  • 16 KB (a good choice for applications that generate sequential I/O, such as multimedia)

5

Select OK.

Result: The storage subsystem controller cache settings are updated.

Related Topics

Changing Logical Drive Properties

Learn About Cache Memory Protection

Learn About Cache Settings and Performance