volume centos-etc-httpd
     type protocol/client
     option transport-type tcp/client     # for TCP/IP transport
#     option remote-host roundrobin.gluster.local       # DNS Round Robin pointing towards all 3 GlusterFS servers
     option remote-host 127.0.0.1
     option remote-subvolume raid5-httpd-conf        # name of the remote volume
   end-volume
  
   volume centos-var-www
     type protocol/client
     option transport-type tcp/client     # for TCP/IP transport
#     option remote-host roundrobin.gluster.local       # DNS Round Robin pointing towards all 3 GlusterFS servers
     option remote-host 127.0.0.1
     option remote-subvolume raid5-var-www        # name of the remote volume
   end-volume

#   volume writeback
#     type performance/write-behind
#     option aggregate-size 131072 # unit in bytes
#     subvolumes centos-1
#   end-volume
 
#   volume readahead
#     type performance/read-ahead
#     option page-size 65536     # unit in bytes
#     option page-count 16       # cache per file  = (page-count x page-size)
#     subvolumes writeback
#   end-volume