Parallel backup CDS processing to tape allows the control data set and journal backups to be performed concurrently, thereby reducing the time required for the CDS backup function.
If you specify BACKUPDEVICECATEGORY(TAPE), your datamover is DFSMShsm, and you want parallel backup processing, then you must specify PARALLEL, because NOPARALLEL is the default. When using DFSMSdss as the data mover and going to tape, parallel processing must be specified.
If CDS backup is invoked while the control data sets are accessed in RLS mode, DFSMSdss must be the datamover. If the backup is directed to tape, the PARALLEL parameter of the SETSYS CDSVERSIONBACKUP(BACKUPDEVICECATEGORY) must be specified.
When backing up to tape in parallel mode, one tape device for each data set to be backed up is required. For instance, if all three control data sets and the journal are to be backed up, then four tape drives are required.
When the backup of the control data sets is in parallel mode, all of the resources necessary for the backup are allocated before the control data sets and the journal are reserved.