Parallelism for fast replication volume recovery from tape

The default value for the maximum number of concurrent volume recovery from dump tasks is 1. A SETSYS parameter is defined to manage the maximum number of tasks for volume recovery from dump. SETSYS MAXDUMPRECOVERTASKS is used to specify the maximum number of concurrent volume recovery from dump tasks. The maximum level of parallelism for multi-tasked recovery is limited by the number of tape drives available and how volumes are stacked on the dump tapes. If all volumes being recovered are stacked on a single tape, then only a single recovery task can be started.

The following example shows that as many as 32 volume recovery from dump tasks can run concurrently:

SETSYS MAXDUMPRECOVERTASKS(32)

A maximum of 64 tasks can be specified. To reduce the time required for fast replication volume recoveries from dump, DFSMShsm scans the dump volume recover queue for other volumes that are on the same tape before requesting the tape be dismounted. For more information about using the MAXDUMPRECOVERTASKS parameter, see SETSYS command: Establishing or changing the values of DFSMShsm control parameters.