Backing up to multiple tape data sets

SETSYS CDSVERSIONBACKUP(BACKUPCOPIES(copies) -
     BACKUPDEVICECATEGORY(TAPE))

You can choose to specify a unit name, density, and retention period or expiration date.

The following example describes the process of backing up the control data sets and journal data set to multiple tape backup data sets.

1. The following command is specified:

   SETSYS CDSVERSIONBACKUP (BACKUPCOPIES(3) -
        DATAMOVER(DSS) -
        BACKUPDEVICECATEGORY(TAPE))

   BACKUPCOPIES(3) indicates the maximum number of cataloged backup data sets for each control data set and the journal data set.

2. DFSMShsm backs up the control data sets and the journal data set. DFSMShsm puts only one backup data set on a specific tape. Because you do not have to preallocate backup data sets when you use tape, DFSMShsm dynamically allocates a new backup data set. The default backup data set name is the same for tape as for DASD. Therefore, if you have not specified the backup data set name with the SETSYS CDSVERSIONBACKUP command, DFSMShsm uses the default backup data set name and the correct final qualifier for the new backup data set. In this case—the first time DFSMShsm backs up the four data sets—the backup data sets have the following names:
   • HSM.MCDS.BACKUP.D0000001
   • HSM.BCDS.BACKUP.D0000001
   • HSM.OCDS.BACKUP.D0000001
   • HSM.JRNL.BACKUP.D0000001
   The second time DFSMShsm backs up the four data sets, it uses a final qualifier of D0000002.

   • HSM.MCDS.BACKUP.D0000002
   • HSM.BCDS.BACKUP.D0000002
   • HSM.OCDS.BACKUP.D0000002
   • HSM.JRNL.BACKUP.D0000002
3. The third time DFSMShsm backs up the four data sets, it dynamically allocates a third set of backup data sets and uses a final qualifier of D0000003.
   After DFSMShsm successfully backs up the control data sets and the journal data set for the fourth time, it uncatalogs the set of backup data sets whose final qualifier is D0000001 and invokes installation exit ARCTVEXT for the rolled-off version of each successfully backed-up data set.

   Note: If the backup is not successful for a particular data set, the oldest version of that data set is not rolled off, and DFSMShsm invokes the tape installation exit, ARCTVEXT, that allows you to reuse the bad backup tapes.
4. DFSMShsm optionally invokes the control data set backup user exit ARCCBEXT, allowing you to process the backup version after DFSMShsm creates it.