Explanation: DATAMOVER(HSM | DSS) is an optional subparameter of the CDSVERSIONBACKUP parameter specifying the type of data movement to be used when performing CDSVERSIONBACKUP of the DFSMShsm control data sets. DFSMSdss must be specified as the datamover for CDS backup when you are using RLS mode.
| Subparameter | Explanation |
|---|---|
| HSM | The DFSMShsm control data sets are backed up using the AMS EXPORT function. The journal data set is backed up using sequential I/O. |
| DSS | The DFSMShsm control data sets are backed up by invoking the DFSMSdss logical dump function for each data set. The journal is backed up using sequential I/O. Using DFSMSdss as the datamover allows you to exploit the concurrent copy function. Control data sets and the journal are always backed up in parallel. |
When you use DFSMSdss rather than DFSMShsm as the data mover, concurrent copy can be used and the CDSs will be validated as they are backed up. Concurrent copy allows the CDS backup to complete as soon as the journal has been backed up so that DFSMShsm can begin processing requests before the CDS backups are completed.
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.