Aggregating Three Storage Servers with Unify

From GlusterDocumentation

Server Volume Specification

# file: /etc/glusterfs/glusterfs-server.vol
volume brick
  type storage/posix
  option directory /data/export
end-volume

volume brick-ns
  type storage/posix
  option directory /data/export-ns
end-volume

volume server
  type protocol/server
  option transport-type tcp/server
  option auth.ip.brick.allow *
  option auth.ip.brick-ns.allow *
  subvolumes brick brick-ns
end-volume

Client Volume Specification

# file: /etc/glusterfs/glusterfs-client.vol
volume remote1
  type protocol/client
  option transport-type tcp/client
  option remote-host storage1.example.com
  option remote-subvolume brick
end-volume

volume remote2
  type protocol/client
  option transport-type tcp/client
  option remote-host storage2.example.com
  option remote-subvolume brick
end-volume

volume remote3
  type protocol/client
  option transport-type tcp/client
  option remote-host storage3.example.com
  option remote-subvolume brick
end-volume

volume remote-ns
  type protocol/client
  option transport-type tcp/client
  option remote-host storage1.example.com
  option remote-subvolume brick-ns
end-volume

volume unify0
  type cluster/unify
  option scheduler rr # round robin
  option namespace remote-ns
  subvolumes remote1 remote2 remote3
end-volume