wherein any of the storage arrays may take over as {HEAD ~ the primary device} in {TAIL ~ response} to sensing a failure of the primary device 
in
wherein any of the storage arrays may take over as { HEAD ~ the primary device } in { TAIL ~ response } to sensing a failure of the primary device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH