{HEAD ~ The access} is provided either via {TAIL ~ block level requests} over the SAN or via file level requests made to a server over a local area network  
{ HEAD ~ The access } is provided either via { TAIL ~ block level requests } over the SAN or via file level requests made to a server over a local area network
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH