Serialization for the fast replication function

Attention: It is the responsibility of the caller of DFSMShsm to ensure that the source volumes are in a state such that DFSMShsm can process them for a meaningful recovery. This includes protecting against data set level updates (actual changes to the data) and volume level changes (DADSM functions such as allocations, renames, extends and scratches). By default, DFSMSdss serializes on the VTOC of each volume as it is processed to prevent DADSM functions from occurring against that volume.

If the caller needs to prevent DADSM functions from being performed against the set of volumes in the copy pool during the backup, it is the caller's responsibility to do so. This should be done by serializing on all of the VTOCs before invoking DFSMShsm. Serializing on the VTOC prevents DADSM functions and also prevents DFSMSdss functions such as DEFRAG, COPY and RESTORE from modifying the VTOCs. When you perform this serialization, use the NOVTOCENQ parameter with the FRBACKUP command to indicate that DFSMSdss should not serialize on the VTOC of each volume.