The NFS file system on OpenVMS includes a hierarchy of devices,
    directories, and files stored on a File-11 On-Disk Structure
    (ODS-2) formatted disk.

    You can set up and export two different kinds of file systems:

    o  Traditional OpenVMS file system

    o  UNIX (container) file system built on top of an OpenVMS file
       system.

    To set up and maintain these file systems, you issue management
    commands.