The UNIT= parameter is used to match with the DYNnUNIT/DYnnUNIT values, and will mark the volume as assigned to DYNn/DYnn. The UNIT parameter must be specified if the tape volume requires one of the special DYNnUNIT/DYnnUNIT assignments. If the volume was originally assigned to one of the DYNn/DYnn units, it should probably be rebuilt with the same unit assignment. The original assignment can be determined by an examination of a LISTV report for the volume in question. The DYNn/DYnn assignment is verified to be the same in the case of a selective rebuild into an existing volume. The TYPE= parameter of the RESET command of the IXUPDTE utility can be used to assign the correct DYNn/DYnn unit if the wrong one is assigned.
Note: A full rebuild of an Archive data set is not allowed if an Archive data set already has an existing entry in the ARCHVOLS. In such a case, either the Archive data set must be scratched before resubmitting the job or a selective rebuild requested. To scratch the Archive data set, RESET command with the KEY= and SCRATCH parameters are described in RESET Command.
If it is necessary to retrieve one or only a few data sets from a tape, rather than doing a RESET on the tape, consider doing a selective rebuild of the tape by specifying either or both of the DSNAMES or FILENOS parameters:
To avoid having DSNINDEX records point to copy archives, do not rebuild from archives that are considered copy volumes. Rebuild the primary archive and then copy with the COPY utility.
CA 1 Tape Management users that use either the direct or External Data Manager (EDM) interfaces should be aware that CA Disk will not update the TMC expiration date during REBUILD. You will need to update the TMC record manually to reflect the correct expiration date.
Some data set index entries for a given tape Archive data set have either expired or have been PURGED, but the tape has not been overwritten yet, and one or more data sets on that tape must be restored.
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