Backup Server activates non-rewinding logic only if the label version on the tape is greater than or equal to 5.
To activate this logic, you must execute a dump command with the with init clause. If a dump without init is initiated onto a volume with a label version less than 5, you are prompted to change the volume, and the dump starts on the next volume. The label version of a multivolume dump does not change in the middle of the volume set.