Mixing Unify and Automatic File Replication

From GlusterDocumentation

Server Volume Specification

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

volume brick-mirror
  type storage/posix
  option directory /data/export-mirror
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-mirror.allow *
  option auth.ip.brick-ns.allow *
  subvolumes brick brick-mirror 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 remote1-mirror
  type protocol/client
  option transport-type tcp/client
  option remote-host storage1.example.com
  option remote-subvolume brick-mirror
end-volume

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

volume afr0
  type cluster/afr
  subvolumes remote1-mirror remote2-mirror
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 switch
  option switch.case *.db:afr0;*:remote1,remote2 # 2 copies of all .db files only
  option namespace remote-ns
  subvolumes remote1 remote2 afr0
end-volume