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