There may be instances in which an exported logical volume is needed during job processing and the logical volume has not previously been imported. To expedite this process, the library allows an operator to initiate a single volume import operation at the library manager. The operator enters the stacked volume containing the logical volume to import and indicates which logical volume is being imported. This eliminates the need for the host to write the logical list volume discussed in Importing logical volumes into a 3494 VTS system.

To further assist in this process, when a logical volume is exported from the library, the volume record in the TCDB is updated with a shelf location of STACKED=volser (if the TCDB record is retained and the shelf location is blank). The volume not in library installation exit sample program, CBRSPUXV, also recognizes a shelf location of STACKED=volser and displays the stacked volume. This allows the operator to identify the specific stacked volume on which the requested logical volume resides. If an installation is not using this default support, nor DFSMSrmm, custom modifications to the volume not in library installation exit will need to be made.

The sample volume not in library exit supplied by DFSMSrmm also takes into account whether an exported logical volume is being requested and will display the stacked volume on which the logical volume resides.

As with a host initiated import operation, when the single volume import operation is complete, all hosts attached to the VTS system that performed the operation will be notified of this completion. Only one import operation, host or library initiated, is allowed per physical library.