DFSMShsm migrates only cataloged data sets. When a data set migrates, the volume serial number of the data set is replaced with MIGRAT in the catalog. DFSMShsm uses the volume serial number of MIGRAT to specify that a data set has migrated. Therefore, an installation must not have any volume with a volume serial number of MIGRAT. If it has, data access failures could result.
DFSMShsm does not recognize JOBCAT and STEPCAT DD statements, so any data sets that require JOBCAT or STEPCAT DD statements appear as uncataloged to DFSMShsm. Because DFSMShsm does not recognize JOBCAT or STEPCAT DD statements, DFSMShsm uses only catalogs available through the standard catalog search. Multilevel alias support is part of the standard catalog search.