Since the backup copy of the catalog is the basis for forward recovery, steps should be taken to ensure the integrity of the catalog when it is backed up. We suggest that you run IDCAMS EXAMINE, DIAGNOSE ICFCATALOG, and LISTCAT VOLUMES at backup time.

If the catalog fails one of these diagnostic tests, corrective action should be taken as soon as possible. Subsequent backups of the catalog cannot provide an adequate base for recovery. Errors in the backup copy are not corrected by the ICFRU.