Implementing the PAV option enhancement

Before you begin: Ensure that your system is running at z/OS® V1R6.

Migration actions: If you do not plan to exploit the PAV volume selection capability, you do not need to perform any migration actions. However, if you plan to exploit the PAV capability, you must make changes to the SMS configuration.

Perform the following steps to implement the PAV volume selection capability in the storage class:

1. Modify the PAV option in the SMS storage classes that are assigned to data sets that require high performance.

   For the detailed steps, see Modifying storage classes to enable the PAV option.

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2. Define new storage classes with a value other than NOPREFERENCE specified for the PAV option.

   For the detailed steps, see Defining new storage classes with the PAV option enabled.

Result: Now you have more control over the volume selection process for a SMS-managed data set, depending on whether a volume is PAV enabled. You can update automatic class selection (ACS) routines to use the new or modified storage classes with the PAV capacity enabled.

Restriction: Striped data sets and best-fit data set allocations support the PAV option in a limited way. If PAV capability is required, all volumes that do not have this capability are rejected. However, if you specify a PAV capability of Preferred, Standard, or Nopreference for a striped or best-fit data set, this PAV option is ignored.