DFSMShsm uses the same procedures during subsequent daily backup volume selection as those described in Selecting initial daily backup volumes (DASD or tape). However, after a volume backup task has obtained a daily backup volume, it continues to use that volume until the volume is no longer needed or becomes full, or until certain error conditions occur.
If a DASD daily backup volume does not contain enough available space for the backup version of the data set DFSMShsm is backing up, or contains enough total available space for the backup version but the space is too fragmented, DFSMShsm follows the procedures described in Selecting subsequent DASD daily backup volumes.
If you use both DASD and tape backup volumes, DFSMShsm can start backing up a volume to a DASD daily backup volume and continue with a tape daily backup volume. However, after DFSMShsm has selected a tape daily backup volume to back up a volume, it uses only tape backup volumes when additional backup volumes are required for the backup of the current volume.
If end-of-volume is reached while DFSMShsm is writing on a tape daily backup volume, DFSMShsm follows the procedures described in Selecting subsequent tape daily backup volumes.