At the beginning of processing, DFSMShsm obtains a list of the active management classes in the system. See DFSMShsm retrieval of management classes and storage groups for a discussion of the exception. DFSMShsm then calculates the inactive age of each data set and compares it to the value of the LEVEL 1 DAYS NON-USAGE attribute in the management class with which the data set is associated. If the inactive age is greater than or equal to the value of the LEVEL 1 DAYS NON-USAGE attribute, the data set migrates to an ML2 volume, unless the value of the attribute is NOLIMIT. If the attribute value is NOLIMIT, the data set does not migrate.
The TARGETLEVEL parameter does not determine the level to which SMS-managed data sets migrate. However, if the MIGRATIONLEVEL2 subparameter is specified with a device category of TAPE or DASD, 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 a level 2 volume of the category specified by the TAPEMIGRATION parameter of the SETSYS command.