Access to a MSCP/TMSCP class device may be available to an
    OpenVMS node from more than one host or storage controller. Use
    the SET PREFERRED_PATH command to specify a particular host or
    preferred path to access a specific MSCP class disk or TMSCP
    class tape device.

    If a preferred path is specified, the normal OpenVMS path
    selection process is modified to select the user-specified path
    over other available paths, assuming the user-specified path is
    available.

    This command is only meaningful for MSCP/TMSCP class devices that
    have more than one path available.

    Format

      SET PREFERRED_PATH  device-name: