Interrupting and restarting primary space management, secondary space management, or event-driven migration

Primary space management, secondary space management, or event-driven migration can be interrupted during the course of their processing either intentionally or inadvertently. If you are not using the secondary host promotion function, when DFSMShsm restarts, it resumes its work near the point where it left off.

If you are in a multiple DFSMShsm-host environment, and are using the secondary host promotion function, a secondary host can take over the unique functions that were being performed by a primary host that has failed. Secondary host promotion also allows another host to take over the secondary space management functions from either a primary or secondary host that has failed.