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