cat /etc/glusterfs/glusterfs-server.vol
Server: Node2
volume brick
  type storage/posix
  option directory /home/glustertest
end-volume

volume server
  type protocol/server
  subvolumes brick
  option transport-type tcp/server     # For TCP/IP transport
  option client-volume-filename /etc/glusterfs/glusterfs-client.vol
  option auth.ip.brick.allow *
end-volume

Client: Node1
cat /etc/glusterfs/glusterfs-client.vol
volume brick1
  type storage/posix
  option directory /home/glustertest
end-volume

volume brick2
  type protocol/client
  option transport-type tcp/client
  option remote-host 10.8.3.216
  option remote-subvolume brick
end-volume

volume afr
  type cluster/afr
  subvolumes brick1 brick2
  option replicate *:3
end-volume