If DFSMStvs fails or abnormally ends, all in-flight units of recovery that were using DFSMStvs at the time of its failure are backed out. A unit of recovery that is in-flight is one that has made a change to a recoverable resource but has not yet committed or backed out that change. The backouts for these units of recovery are not performed at the time of the failure by the failed DFSMStvs instance. The backouts are performed either at the time of the failure or later by a peer recovery instance of DFSMStvs. You can find more information about DFSMStvs restarts and peer recovery in Diagnosing and recovering from DFSMStvs problems.

In the event of a DFSMStvs failure during the backout, the recovery or restart processing repeats the entire backout. Backout processing tolerates duplicate records and attempts to delete nonexistent record conditions, which arise from the attempt to repeat a backout operation that was previously completed.