(Alpha and Integrity servers) DEVICE_NAMING is a bit mask
    indicating whether port allocation classes are used in forming
    SCSI device names.

    Following is the bit definition:

    Bit   Definition

    0     If 1, enable new naming.

    1     Must be 0. This bit is Reserved for use by VSI.

    2     If 1, cloned device unit numbers wrap after 9999(not 65472).

    3     If 1, cloned device unit numbers wrap after 32767(not 65472).

          Note that even if both bits are zero, device unit numbers will
          wrap after 9999 if "nodename$" is prefixed to the name of the
          device in question (e.g. VMS123$DKA100:); devices whose drivers
          support larger device numbers will wrap after 65472 (or 32767
          if bit 3 is set) only if the nodename is not built into the
          device name.

    For more information about port allocation classes, see the VSI
    OpenVMS Cluster Systems manual.