To SANCP, the term "WWID", unless otherwise qualified, refers to
    the system's view of the set of all paths to a single port on a
    SAN storage device without regard to which drivers provide the
    paths. When a WWID is modified with the SET command, all paths
    are affected

    More generally, WWIDs are World-Wide unique Identifiers which are
    assigned to a FibreChannel port by its device's manufacturer. Each
    port will have a Node WWID and a Port WWID - since the Node WWID
    can be used to group Port WWIDs on the same device, only the Port
    WWID is guaranteed to be unique within a Fabric