SYSTEM-F-TIMEOUT, device timeout

      After waiting two minutes for the component(s) in question to
      acknowledge the shutdown request, the PMDF SHUTDOWN utility
      returns control to the command line. The shutdown request
      is still outstanding and should be honored by the PMDF
      component(s) for which the command was issued; the utility
      has just given up waiting for the component(s) to immediately
      acknowledge the request as it (they) may be busy with existing
      activity.