While these changes are in progress, {TAIL ~ the disk array} remains on {HEAD ~ line} and most host data is available for access and modification 
While these changes are in progress , { TAIL ~ the disk array } remains on { HEAD ~ line } and most host data is available for access and modification
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH