Subsequent spill backup volume selection (DASD and tape)

After a volume backup task has obtained a spill backup volume, the task continues to use that volume until the volume becomes full, the spill of the full DASD daily backup volume completes, or certain error conditions occur.

Subsequent DASD spill backup volume selection

If a DASD spill backup volume is being used and does not contain enough available space for the backup version currently being moved or contains enough total available space for the backup version but the space is too fragmented, DFSMShsm fails the movement of the backup version. DFSMShsm considers the space too fragmented if the allocation of the backup version cannot be done in five or fewer extents. When the new allocation for the backup version fails because of insufficient space for the backup version, DFSMShsm performs the procedures described in Selecting subsequent DASD daily backup volumes.
Note: In reading the procedures just referred to, substitute the term “spill” for the term “daily”.

Subsequent tape spill backup volume selection

If end-of-volume is reached while DFSMShsm is writing on a tape spill backup volume, DFSMShsm performs the procedures described in Selecting subsequent tape daily backup volumes.
Note: In reading the procedures just referred to, substitute the term “spill” for the term “daily”.

If DFSMShsm cannot find a tape volume meeting the preceding criteria or if you specified SETSYS SELECTVOLUME(SCRATCH), DFSMShsm requests that a scratch tape be mounted on the already allocated unit. When the operator mounts a scratch tape, DFSMShsm assigns it as a tape spill backup volume.

After the operator mounts the volume, DFSMShsm continues moving backup versions to that volume.

Certain error conditions, such as an error in writing on the tape, cause DFSMShsm to switch tape spill backup volumes. If an error occurs, DFSMShsm considers the tape spill backup volume to be full, releases the volume, and selects another tape spill backup volume as described in Initial spill backup volume selection (DASD and tape), but only a tape volume is selected. After DFSMShsm selects a tape spill backup volume for the spilling of a full DASD daily backup volume, it uses only tape spill backup volumes when additional spill backup volumes are required during the current spilling of the full DASD daily backup volume.