Part of DFSMShsm incremental volume backup or full volume dump is to copy the VTOC of the volume being processed to a data set on a DFSMShsm owned volume. The volume serial number of the volume being processed is volser1. The data set name of the VTOC copy is dsname. The DFSMShsm volume containing the VTOC copy data set has a volume serial number of volser2.