In order for DFSMSdfp to use the CF for VSAM RLS, after you define one or more CF cache structures to MVS, you must also add them in the SMS base configuration.

To add CF cache structures to the base configuration, you associate them with a cache set name. This cache set name is also specified in one or more storage class definitions. When a storage class associated with a data set contains a cache set name, the data set becomes eligible for VSAM record-level sharing and can be placed in one of the CF cache structures associated with the cache set. The system selects the best cache structure in which to place the data set.

Refer to Defining CF cache structures and Defining the primary CF lock structure for more information on using CFRM policies to define CF cache and lock structures.

Perform the following steps to define CF cache structures to DFSMS.

1. Select option 8, Control Data Set, from the ISMF Primary Option Menu for Storage Administrators, to display the Control Data Set (CDS) Application Selection panel.

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2. Supply values on the CDS Application Selection panel:

   CDS Name

   Specify the name of the SCDS that is to contain the base configuration for VSAM RLS. The CDS Name field is primed with the last used SCDS name. This name might differ from the SCDS name of your base configuration for VSAM RLS.

   Option

   Select option 7, Cache Update. This displays the CF Cache Set Update panel.

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3. Define your CF cache sets on the CF Cache Set Update panel. The panel allows you to define up to 256 CF cache sets. Each CF cache set can have up to eight CF cache structure names assigned to it. Use the cache structure names you defined in the MVS CFRM policies.

Figure 1 shows how CF cache structures can be defined in multiple cache sets, and also shows how data sets associated with a storage class definition containing a cache set name can be placed in multiple cache structures.

Figure 1. Example of CF Cache Structure Definition in Base Configuration