z/OS DFSMShsm Implementation and Customization Guide
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Processing interval considerations for automatic primary space management

z/OS DFSMShsm Implementation and Customization Guide
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If you change the frequency of a processing interval, be aware of the following:
  • Changing the frequency of the processing interval for a function applies to all occurrences of that function. You cannot use the processing interval to allow processing of one group of volumes every day and at the same time process another group of volumes every other day.
  • If the change of frequency is meant to be temporary, such as for testing purposes, you need to use the PATCH command to change the frequency back to its original value when you are finished testing. To accomplish this use the PATCH command in the following way:
    For SMS volumes:
            PATCH .MCVT.+414 X'0000C4E0' /* Reset the SMS automatic primary */
                                         /* space management processing     */
                                         /* interval to its original 14     */
                                         /* hour day.                       */
     
    For non-SMS volumes:
            PATCH .MCVT.+488 X'0000C4E0' /* Reset the non-SMS automatic     */
                                         /* primary space management        */
                                         /* processing interval to its      */
                                         /* original 14 hour day.           */
     

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