z/OS DFSMShsm Implementation and Customization Guide
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Reasons why automatic primary space management can appear not to be running

z/OS DFSMShsm Implementation and Customization Guide
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If an automatic function does not start when you think it should, there are many conditions that can be the cause. They include but are not limited to the following:

  1. The function is held or DFSMShsm is in EMERGENCY mode.
  2. Today is a "N" day in the automatic processing cycle.
  3. The function is already running.
  4. The function appears to have already run today. This means that the window is defined in a way such that the present time is a new day in the automatic processing cycle. For automatic primary space management and automatic dump, the planned start time must be later than the last actual completion time.
  5. The operator’s permission reply is outstanding.

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