DFSMShsm retrieval of management classes and storage groups

If you are changing the definitions of management classes, you should know when the new definitions will take effect. DFSMShsm retrieves a list of all currently defined management classes before the following functions begin:
  • Automatic volume space management, which includes primary space management and interval migration
  • Automatic secondary space management
  • Command volume space management

If one of the volume functions is in progress or has just completed, and another volume function is about to begin, DFSMShsm uses the list of management classes that exists from the prior processing. When secondary space management begins, a list of management classes is retrieved from the active SMS configuration and is not shared with the other functions in the preceding list.

When DFSMShsm begins automatic volume space management, it retrieves the storage group definitions to determine which SMS-managed volumes are eligible for space management.

A storage group must meet the following criteria for DFSMShsm to consider it for processing:
  • It must be type POOL.
  • It must have a status of either ENABLED, QUIESCED NEW, or DISABLED NEW.
  • It must have AM=Y, AM=I, or AM=P.