If AGE(0) is entered for a migration level 1 volume, migration copies of all SMS-managed data sets are moved from the volume and placed on other migration level 1 volumes or migration level 2 volumes, depending on each data set’s management class. If the management class has a value specified for the LEVEL-1-DAYS-NONUSAGE and the age is met, the data set migrates to a migration level 2 volume. If the management class has a value specified for LEVEL-1-DAYS-NONUSAGE and the data set age does not meet the criterion or if the data set has an attribute of NOLIMIT, the data set migrates to another migration level 1 volume.
If an AGE other than zero is specified for migration level 1 volumes, the management class for each SMS data set is used to determine whether the migration copy is moved to another volume.
If AGE (0–999) is entered for a migration level 2 volume, the age specified applies to all of the data sets on the volume, because there are no management class attributes that apply to SMS data sets on migration level 2 volumes.
If AGE (0–999) is entered for a backup volume, the age specified applies to all of the data sets on the volume. Expiration processing of backup versions is not performed during FREEVOL.
Defaults: If you do not specify AGE, the default is zero. A default of zero clears the volume of all migrated data except the ones in need of backup, or it clears the backup volume if the RETAINNEWESTVERSION subparameter is not specified.