CDSVERSIONBACKUP (BCDSBACKUPDSN): Specifying the initial characters of the backup data set name for the backup control data set

Explanation: BCDSBACKUPDSN(dsname) is an optional subparameter of the CDSVERSIONBACKUP parameter specifying the initial characters of the data set name to be used when allocating the backup data set for the BCDS. For dsname, specify the initial characters of the data set name. You can use up to 35 initial characters including the periods (.); however, the 35 initial characters cannot end with a period. If the BCDS is defined as a multicluster, then only 31 characters can be used. DFSMShsm appends a final qualifier of .Dnnnnnnn or .Vnnnnnnn to the backup name you choose. DFSMShsm uses the total name to allocate the backup data set for the BCDS.

Note: With the multicluster CDS support, up to four names for the BCDS may be required, depending on how you have split the BCDS. DFSMShsm generates these names using the user-supplied name (or default) and appending .DSx before the final qualifier. x will be a number 1–4 representing each cluster. For example, if the backup data set name for the BCDS is:

   DFHSM.BCDS.BACKUP

and you have split the BCDS into 4 clusters, then the generated data set names will be:

   DFHSM.BCDS.BACKUP.DS1.D0000000
   DFHSM.BCDS.BACKUP.DS2.D0000000
   DFHSM.BCDS.BACKUP.DS3.D0000000
   DFHSM.BCDS.BACKUP.DS4.D0000000

If the BCDS is not defined as a multicluster, the user-defined name is used as is.

SMS relationship: Parameter has the same meaning when applied to SMS-managed or non-SMS-managed DASD volumes or data sets.

SETSYS default: None.

DFSMShsm default: See the DFSMShsm defaults for CDSVERSIONBACKUP: Specifying whether the control data sets should be backed up to multiple data sets.