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Verify that the CTTSTK utility is not commented out in the New Day procedure (CTTDAY).
If the CTTSTK utility was commented out, BMC recommends that you run this utility on the Media Database (it is normally run on the Trace file) to collect the statistics needed for stacking implementation.
Note: If the Dynamic Data Set Stacking facility is activated without running utility CTTSTK, stacking decisions are based on the default data set length specified in the STKDEFSZ parameter (described above).
For more information about the CTTSTK utility, see the Control-M/Tape chapter of the INCONTROL for z/OS Utilities Guide.
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