KS3A504E ERROR [return_code/reason_code] ATTEMPTING TO READ VTOC OF [volser]
Explanation
The collection task was unable to read the VTOC of the specified volume, for the specified reason.
System action
Collection for the indicated volume terminates. Other collection tasks continue.
User response
This message might be issued in response to a problem, with the VTOC of the specified volume and not a program error. If the volume can be successfully accessed through other means (for example, ISPF option 3.4), contact IBM® Software Support.