Specifying Storage Subsystem Cache Settings

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Procedure

1

Either select the Storage Subsystem >> Change Cache Settings pull-down menu option or use the right mouse button to select the storage subsystem in the Logical View. Then, select Change Cache Settings from the pop-up menu.

Result: The Change Cache Settings dialog is displayed.

2

Select the percentage of unwritten data in the cache that will trigger a cache flush, in the Start Value 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 Value 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) and 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

Specifying Logical Drive Properties

Learn About Cache Memory Protection

Learn About Cache Settings and Performance