Use Device Support Facilities (ICKDSF) to convert a VTOC to a non-indexed format to update the volume. If you do not, keep the following considerations in mind:

• Initializing a Volume: If you do not change the volume serial number, you must vary the volume offline before starting the job.
• Restoring a Volume from a Dump Tape: There are no operational requirements if you change the volume serial number or do a partial restore that does not modify the VTOC or VTOC index. If you do a restore, and modify the VTOC or VTOC index without changing the volume serial number, you must vary the volume offline after it is restored.
• Copying a Volume: There are no operational requirements if you change the volume serial number of the receiving volume or do a partial dump without modifying the VTOC or VTOC index. If you modify the VTOC or VTOC index without changing the volume serial number, you must vary the receiving volume offline after it is copied.