Distributed Replicated Storage

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When running the server and client on all 4 nodes, you basically create a RAID10 over network. If you lose one server from replication1 and one from replication2, the distributed volume continues to work.

The size of the distributed storage is calculated by replication1 + replication2, where both replication volumes are as big as the smallest brick.

[edit]

Server volfile

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

volume locks
  type features/locks
  subvolumes posix
end-volume

volume brick
  type performance/io-threads
  option thread-count 8
  subvolumes locks
end-volume

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

[edit]

Client volfile

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

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

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

volume remote4
  type protocol/client
  option transport-type tcp
  option remote-host storage4.example.com
  option remote-subvolume brick
end-volume

volume replicate1
  type cluster/replicate
  subvolumes remote1 remote2
end-volume

volume replicate2
  type cluster/replicate
  subvolumes remote3 remote4
end-volume

volume distribute
  type cluster/distribute
  subvolumes replicate1 replicate2
end-volume

volume writebehind
  type performance/write-behind
  option window-size 1MB
  subvolumes distribute
end-volume

volume cache
  type performance/io-cache
  option cache-size 512MB
  subvolumes writebehind
end-volume

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