With DFSMSrmm stacked volume support enabled, you can manage the movement of logical volumes by using stacked volumes and manage the movement of copy exported stacked volumes. To enable stacked volume support, see Enabling stacked volume support. When stacked volume support is enabled, DFSMSrmm tracks each logical volume export saving the highest priority logical volume required location in the stacked volume required location.

To ensure that stacked volumes are managed correctly, DFSMSrmm inventory management processing (this applies to VRSEL/DSTORE/EXPROC only) checks that stacked volumes reside in a library.

At the completion of export processing for a single stacked volume, DFSMSrmm uses the required location of the stacked volume to attempt to start its movement. If the required location is not shelf-managed, DFSMSrmm sets the destination, but does not yet mark the stacked volume as being 'intransit'. The next time inventory management is run, DFSMSrmm checks the library to see if the stacked volume has been ejected, and if so, the stacked volume is marked as being 'intransit'.

If the required location is shelf-managed, DFSMSrmm storage location management processing starts the volume move. Storage location management processing starts movement of stacked volumes by assigning bin numbers for storage locations and setting the destination for the volume. Inventory management checks to see if closed, not-empty, or copy exported stacked volumes still reside in their location, and marks those no longer resident as 'intransit'.

Stacked volumes that are 'intransit' to storage locations are confirmed only if a global confirm move has been requested for the location and destination pair. Later, when stacked volumes move from storage locations they are set 'intransit' by storage location management processing. Those stacked volumes that are 'intransit' to a destination VTS are checked for library residence at their destination and the move confirmed if found resident.

The result is that DFSMSrmm can automatically determine some of the moves for stacked volumes and needs you to confirm those to storage locations.