1.TCPIP> DISMOUNT DNFS3:

      Makes the file system mounted on local device DNFS3:
      inaccessible to local users.

    2.TCPIP> DISMOUNT DNFS4:[USR.MNT]

      Dismounts only the specified mount point, [USR.MNT], on local
      device DNFS4:.

    3.TCPIP> DISMOUNT DNFS5: /WAIT

      Dismounts the DNFS5:[000000] mount point and waits for it to
      occur.

    4.TCPIP> DISMOUNT /ALL

      Dismounts all mount points on all devices.

    5.TCPIP> DISMOUNT /ALL /HOST="robin"

      Dismounts all mount points served by host robin.