Perform the following steps to set up the PAV option in existing storage classes:

1. Use ISMF to access the Storage Class application.

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2. Select option 4, Alter a Storage Class.

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3. On page 2 of the Storage Class Alter panel, set the Parallel Access Volume Capability value to one of the following values:
   • R (required)
   • P (preferred)
   • S (standard)
   • N (no preference)

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4. Activate the updated configuration using one of the following methods:
   1. On the CDS Application Selection panel in ISMF, complete one of the following actions:
      • Select the Activate option, or
      • Enter the ACTIVATE operator command on the command line.

        Example: ACTIVATE SCDS dsname

   2. From the operator console, enter the SETSMS command.

      Example: SETSMS SCDS dsname

Result: The PAV option is enabled for this storage class.

Recommendation: When you modify an existing storage class and activate the configuration, you are implicitly modifying the volume selection process for all data sets to which this storage class is assigned. If you do not want the "modified" storage class to apply to all data sets that it is being assigned to, you will need to change the storage class ACS routines.