Explanation: MAXINTERVALTASKS(nn) is an optional parameter specifying the maximum number of automatic interval or event-driven on-demand migration tasks that can run concurrently. It applies to the processing of primary volumes and SMS-managed volumes.
For nn, substitute a decimal number from 0 to 15, specifying the maximum number of concurrent tasks. A zero value allows you to restrict the interval migration or on-demand migration task from running on any host that has MAXINTERVALTASKS set to zero. Once MAXINTERVALTASKS is set to a nonzero value, interval migration or on-demand migration processing will resume on the host.
Tape units must be available to support the maximum number of migration tasks. In a direct-to-tape environment, the number of tape units available must be at least equal to nn. The number of SDSP data sets available should be greater than nn. In addition, in a duplex tape environment, the number of tape units must be at least 2 times nn.
In an environment where data sets can be routed to either DASD or tape, a tape unit is required for each migration task that encounters a data set that is migrated directly to tape. Make sure that you have nn tape units available. Once DFSMShsm has selected a tape unit, that unit will not be released until the automatic volume space management function has completed, or until recall needs the tape. In a duplex tape environment, DFSMShsm selects two tape units for each migration task and these tape units will not be released until the automatic volume space management function is complete.
SMS relationship: Parameter has the same meaning when applied to SMS-managed or non-SMS-managed DASD volumes or data sets.
SETSYS defaults: None.
DFSMShsm defaults: If you do not specify this parameter on any SETSYS command, the default value for the maximum number of concurrent interval migration or on-demand migration tasks (nn) is equal to the value defined for MAXMIGRATIONTASKS. The default value for MAXMIGRATIONTASKS is 2.