During backup runs the number of required ARCHIVE subtasks is automatically calculated as follows:
Without multiplex operation as the number of devices operated in parallel, specified by PARALLEL-RUNS with the default value 1.
With multiplex operation the multiplex factor defines the number of ARCHIVE subtasks which share the same devices. The number of devices multiplied by the multiplex factor specified numerically thus provides the number of subtasks working in parallel.
When MULTIPLEXING-FACTOR=*AUTOMATIC is specified, the actual multiplex factor and thus the number of subtasks is calculated internally in accordance with the number of subtrees from the specification of the files to be saved.
With COPY runs the number of subtasks required is derived from the number of devices operated in parallel regardless of multiplexing.
With RESTORE runs the multiplexing factor used for the backup is also taken into account.