For non-SMS-managed data sets, DFSMShsm compares the time since the data set was last opened against the value specified with the AGE parameter. If the time since the data set was last opened is equal to or more than the value specified with the AGE parameter, DFSMShsm migrates the data set to a volume of the level specified by the TARGETLEVEL parameter. If the MIGRATIONLEVEL2 subparameter of the TARGETLEVEL parameter specifies a device category, the data set migrates to an ML2 volume of the category specified. If the MIGRATIONLEVEL2 subparameter does not specify a device category, the data set migrates to an ML2 volume of the category specified by the TAPEMIGRATION parameter of the SETSYS command.