Specifying the DFSMShsm hosts that process each storage group

When DFSMShsm processes an SMS-managed volume for space management, it records the time at which the volume was processed. If another DFSMShsm host attempts to process the same volume for space management, it checks the time at which the volume was last processed. If the volume was processed within the last 14 hours, DFSMShsm does not process the volume again.

Because of the time-recording process for SMS-managed volumes, DFSMShsm does not require you to control which DFSMShsm host processes which volumes, and you should not do such manual load balancing. However, should you find it necessary to limit processing of certain volumes to one z/OS® image, you can do so with the MIGRATE SYSTEM/SYSPLEX NAME attribute in the storage group.

The system name is the system-wide identifier for the z/OS image, not the identifier assigned with the HOSTID parameter of the DFSMShsm startup procedure.

Example: If only z/OS image 1 were to process storage group SG1 for space management, you could specify:

Storage group 1 (SG1)
  MIGRATE SYSTEM/SYSPLEX NAME ===> PRC1