When a rename or alter request is issued for a migrated data set,
DFSMShsm first recalls the data set and then lets the rename or alter
process continue, with the exception of an IDCAMS ALTER command issued
to change the storage class or management class, or both, of a migrated
data set. When an IDCAMS ALTER command is issued to change either
the storage or management classes, or both, of a migrated data set,
the change is made without recalling the data set. Both DFSMShsm's
and catalog's records are updated to reflect the change.
When data sets are recalled for a rename or alter request, DFSMShsm
does the following:
- Sets the last backup date to zero
- Sets the data-set-changed indicator in the data set VTOC entry
to On
- Sets the date-last-referenced field to the date that the data
set had when it migrated
The results of the preceding actions are as follows:
- The renamed data set is backed up the next time that backup runs.
- The renamed data set probably will migrate soon because the date-last-referenced
field indicates a long period since the data set was opened.