A logical volume is a volume that resides in a virtual tape server library either on DASD (in the tape volume cache as a virtual volume) or on a stacked volume (as a logical volume) and is referenced from the host as if it were a physical volume.

The way you define and enter logical volumes is common regardless of how you set up DFSMSrmm. Other functions are dependent on how you request stacked volumes to be managed. For details of how DFSMSrmm supports export and import processing for logical volumes refer to DFSMSrmm support for stacked volumes when stacked volume support is enabled and DFSMSrmm support for stacked volumes when stacked volume support is not enabled.

When volumes are automatically added to DFSMSrmm, DFSMSrmm sets the volume type based on where the volume resides. If the volume resides in a VTS, DFSMSrmm sets the volume type to logical. If the volume does not reside in a VTS, DFSMSrmm sets the volume type to physical. You can chose to define the volumes to DFSMSrmm rather than having the volumes automatically defined when they are entered into the library. Specify the correct volume type for each volume that you define. If you do not specify the correct volume type for volumes residing in system-managed tape libraries, these volumes will not be processed successfully.

To ensure that all logical volumes are correctly identified to DFSMSrmm as logical volumes, use the DFSMSrmm TSO subcommand example shown in Figure 1 to change the volume type of previously defined volumes. DFSMSrmm allows you to identify any volume as a logical volume as long as it is not resident in a system-managed automated tape library.

RMM SEARCHVOLUME VOLUME(*) LIMIT(*) OWNER(*) LOCATION(vts) -
 CLIST('RMM CHANGEVOLUME ',' TYPE(LOGICAL)')
 EXEC EXEC.RMM.CLIST