MPDEV_POLLER

   (Alpha and Integrity servers) MPDEV_POLLER enables polling of
   the paths to multipath set members when set to ON (1).  Polling
   allows early detection of errors on inactive paths. If a path
   becomes unavailable or returns to service, the system manager is
   notified with an OPCOM message. When set to OFF (0),  multipath
   polling is disabled. The default is ON. Note that this parameter
   must be set to ON to use the automatic failback feature.