Backup/Archive › BACKUP and ARCHIVE Considerations › Backup of Volume VTOCS

Backup of Volume VTOCS

If you specify the SELECT VTOCS and BACKUP command, CA Disk will back up VTOCs from all volumes that are scanned, regardless of whether or not any data sets from these volumes are selected for processing. A backup copy of a VTOC can subsequently be used by RECOVER processing to restrict the recovery to only those data sets listed in the backup copy of the VTOC, excluding from recovery those data sets that were deleted from the volume prior to the backup run.

CA Disk, does not back up the index for an indexed VTOC because it is not needed. It contains no useful or helpful data for either the archive or the restore function. The entries in the index for a VTOC are automatically rebuilt at restore time due to the standard allocation interfaces used by CA Disk.

The following restrictions apply to this support:

• Only the most recent copy of a volume VTOC found in the CA Disk archives will be used as the screening list during recovery processing.
• The VTOC copy cannot be used to overlay the current VTOC on a volume. CA Disk dynamically rebuilds each VTOC entry as each data set is restored.
• If you have a CA Disk Security Interface installed, you will need access to the data set name VTOC.volser, where volser is the volume on which the VTOC resides. Both BACKUP and IXMAINT functions will query any CA Disk Security Interfaces for authority to process this name.

If you are going to backup VTOCs, the following security setup should be done prior to setting RACF protectall on:

• Create profile with ADDSD VTOC.* UACC(NONE) to provide a profile so that the name is legal. The OPERATIONS attribute of the userid associated with user#1's backup job will then provide access to that data set name. The data set name is fictitious and it refers to nothing on spinning DASD. The data set name is only a name so that CA Disk can manage the VTOC backups it optionally takes to help volume recovery operations.