Partitioning tape volumes: PRTITION

Use the PRTITION command to identify special processing for DFSMSrmm to perform during library entry, export/import, eject, and CUA processing, during OPEN processing, and EXPROC processing. The PRTITION commands apply to all volumes, not only system-managed volumes. However, only system-managed volumes benefit for the functions such as library insert, CUA, and eject.

The processing provided is based on volume sets identified by PRTITION entries that you create using PRTITION commands. When a volume is processed during library entry, insert, import, eject, or export, or CUA processing, during OPEN processing, or during EXPROC processing the volume is matched to a PRTITION entry as follows:

The TYPE(RMM|NORMM) is determined. For additional details, see the TYPE operand in PRTITION command operands.
DFSMSrmm matches the volume serial number to a volume set from the most specific volume set to the least specific volume set within TYPE. This uses the VOLUMERANGE and VOLUME values including the volume prefix based on the set scope. DFSMSrmm PRTITION entries are sorted in ascending EBCDIC collating sequence from most specific to least specific matching order within type. VOLUME(*) is least specific.

The DFSMSrmm partitioning support based on the PRTITION commands requires either that you use the CBRUXENT exit shipped with DFSMSrmm or that your customized CBRUXENT calls EDGLCSUX and uses the decisions that EDGLCSUX makes.