The user, through {HEAD ~ a host device}, issues a command to the CSA to create {TAIL ~ the logical data volume} 
The user , through { HEAD ~ a host device } , issues a command to the CSA to create { TAIL ~ the logical data volume }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL