During database backup or restore, the server cannot allocate sufficient mount points for the volumes required.
If the database backup was started with the BACKUP DB command, the database backup is ended and server operation continues. If the database backup was triggered automatically, the backup stops and the server waits for the retry period to expire and then tries the database backup again. A database restore is ended.
For database backup, make more mount points available if necessary. For database restore processing, make sure the device class has sufficient mount points defined in the device configuration information file that is pointed to in the server options file.