This section describes how to assign the cache set names defined in the base configuration to a storage class, so that data sets associated with that storage class can be eligible for VSAM RLS and use CF cache structures. It also describes how to indicate the relative importance of the data associated with the storage class.

Requirement for JES3 users: In a JES3 environment, be careful to define cache set names only in those SMS storage classes that are used by data sets opened for VSAM RLS processing. When you define a cache set name in a storage class, any job accessing a data set associated with that storage class is scheduled on a VSAM RLS-capable system. If all storage classes have cache set names defined for them, then all jobs accessing SMS-managed data sets are scheduled to VSAM-RLS-capable systems. This could cause a workload imbalance between those systems and down-level systems.

To assign the CF cache sets defined in the base configuration to storage classes, perform these steps.

1. Select option 5, Storage Class, from the ISMF Primary Option Menu for Storage Administrators. This displays the Storage Class Application Selection panel.

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2. Supply values on the Storage Class Application Selection panel:

   CDS Name

   Is the name of the SCDS you defined for VSAM RLS in the CDS Name field.

   Option

   Select option 3, Define. This displays the Storage Class Define panel.

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3. Press the DOWN key to view the second page of the Storage Class Define panel.

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4. Supply values on the Storage Class Define panel:

   CF Cache Set Name

   Is the name of the CF cache set you defined in the base configuration.

   CF Direct Weight or CF Sequential Weight

   Specify a weight attribute for the data in one of the fields, to indicate the data's relative importance. The default is a weight value of 6.

   Note: DFSMS only supports the default value. Regardless of what you specify, all data eligible for VSAM record-level sharing is assigned a weight value of 6.