### Add client feature and attach to remote subvolume
   volume gluster1
     type protocol/client
     option transport-type tcp/client     # for TCP/IP transport
     option remote-host 10.137.252.137       # IP address of the remote brick
     option remote-subvolume data1        # name of the remote volume
   end-volume
 
   volume gluster2
     type protocol/client
     option transport-type tcp/client     # for TCP/IP transport
     option remote-host 10.137.252.138    # IP address of the remote brick
     option remote-subvolume data1        # name of the remote volume
   end-volume
 
   ### Add writeback feature
   volume writeback
     type performance/write-behind
     option aggregate-size 131072 # unit in bytes
     subvolumes gluster1
   end-volume
 
   ### Add readahead feature
   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