/STRUCTURE_LEVEL=n Sets the structure level of the volume. Use the value 5 to set the volume to ODS-5. When the /STRUCTURE_LEVEL qualifier is used with other qualifiers, the volume structure level is set prior to the other qualifiers being performed. You cannot use the SET VOLUME command to change a volume from ODS-5 to ODS-2. To reset a volume to ODS-2, see the instructions in the HP OpenVMS System Manager's Manual, Volume 1: Essentials.