How the RECOVER utility retains tape mounts

For input image copies (for the objects being recovered) that are stacked on one or more tape volumes, you do not need to code JCL DD statements to retain the tape volumes on the tape drive. Instead, you can use the PARALLEL and TAPEUNITS keywords. The PARALLEL keyword directs the RECOVER utility to process the objects in parallel. The objects will be sorted based on how the input image copies are stacked on tape to maximize efficiency during the RESTORE phase by retaining the tape volumes on the tape drive and by restoring the input image copies in the right order (by ascending file sequence numbers). The TAPEUNITS keyword will limit the number of tape units (or drives) that the RECOVER utility will use during the RESTORE phase. In special cases, RECOVER cannot retain all of the tape volumes, so the tape volumes may be demounted and deallocated even if the PARALLEL and TAPEUNITS keywords are specified.