Ensure that control data sets and journal data set backup copies are not backed up or migrated. Backing up CDS backup copies is unnecessary and inefficient. Migrating CDS backup copies causes problems because DFSMShsm is unable to access them or recover the control data sets. Consider, for a moment, that your backup copy of the MCDS has migrated and your current MCDS is damaged. The data needed to recall your backup copy is in the damaged (and unusable) current MCDS. If you have no other volume available to put the backup data sets on, and if the volume is SMS-managed, the backup copies must be associated with the NOMIG attribute which prevents them from being migrated. If the CDS and journal backup copies are non-SMS-managed, you can specify a SETMIG command for each of the backup versions of the control data sets and for the journal. For more information about the SETMIG command, see z/OS DFSMShsm Storage Administration. .