Modifying DASD storage control characteristics

You can use the SETCACHE line operator to control the caching in a storage control unit.

Task	Function	Scope	Action
Manage storage control unit characteristics	SETCACHE	Volume and storage control unit	Modifies the caching status, duplexing status, or causes data to be destaged in the storage control units associated with specific DASD volumes. ISMF performs these functions in the foreground using a TSO command or in the background using the ISMF job submission facility.

You can use the SETCACHE line operator from the Volume List panel to modify the storage control unit characteristics. The following characteristics can be modified with the SETCACHE line operator:

Performance characteristics, which control the caching of read or write requests. You can modify these characteristics to reduce the frequency of access to DASD.
Availability characteristics, which control the automatic duplication of the device activity onto a secondary volume. You can also modify these characteristics to move the contents of one volume to another while the data is active.
Resources characteristics, which control how data that is stored in the cache is destaged or discarded. You can directly manage data in cache and nonvolatile storage.

Enter the SETCACHE line operator against a particular volume from the Volume List panel. You can invoke SETCACHE with a PERFORMANCE, AVAILABILITY, or RESOURCES parameter depending on the characteristic you would like to modify. You can also enter SETCACHE without a parameter. On a 3990 Storage Control unit with cache, ISMF takes you to the SETCACHE Features Entry panel. From this panel you can select the characteristic you would like to modify. ISMF takes you to either the PERFORMANCE, AVAILABILITY, or RESOURCES Entry panel. On the Model 3880-13/23, ISMF takes you to the PERFORMANCE Entry panel where you can do your modifications.

The specific features that you can modify depend on the model of the storage control unit that you are working with. You must also have storage administration authorization to use the SETCACHE line operator.

In order to use the SETCACHE function under ISMF, you must modify the IKJTSOxx member in SYS1.PARMLIB. IDCAMS must be added to AUTHPGM NAMES, and SETCACHE must be added to AUTHCMD NAMES.