VMS Help SET, DEVICE, Qualifiers, /POLL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /POLL
       /NOPOLL

    Specifies that the path specified by the /PATH qualifier is to be
    polled for continued availability as a path switch destination.
    This does not affect any attempt to switch to this path. Its
    purpose is only to inform an operator that a path may or may not
    be viable as a path switch destination. By default, all device
    paths are enabled for polling when they are discovered. Note that
    this qualifier applies only to multipath devices.