volume storage-ns1
  type storage/posix
  option directory /tmp/namespace1
end-volume

volume storage-ns2
  type storage/posix
  option directory /tmp/namespace2
end-volume

volume ss1-backup
  type protocol/client
  option transport-type tcp/client
  option remote-host 195.72.193.193
  option remote-subvolume ss1-backup
end-volume

volume ss2-backup
  type protocol/client
  option transport-type tcp/client
  option remote-host 195.72.193.194
  option remote-subvolume ss2-backup
end-volume

volume ss3-backup
  type protocol/client
  option transport-type tcp/client
  option remote-host 195.72.193.195
  option remote-subvolume ss3-backup
end-volume

volume ss4-backup
  type protocol/client
  option transport-type tcp/client
  option remote-host 195.72.193.196
  option remote-subvolume ss4-backup
end-volume

volume backup-1
  type cluster/unify
  option namespace storage-ns1
  option scheduler alu
  option alu.order disk-usage:read-usage:write-usage:open-files-usage:disk-speed-usage
  subvolumes ss1-backup ss2-backup
end-volume

volume backup-2
  type cluster/unify
  option namespace storage-ns2
  option scheduler alu
  option alu.order disk-usage:read-usage:write-usage:open-files-usage:disk-speed-usage
  subvolumes ss3-backup ss4-backup
end-volume

volume backup
 type cluster/afr
 subvolumes backup-1 backup-2
end-volume

volume writeback
  type performance/write-behind
  option aggregate-size 131072
  subvolumes backup
end-volume

volume readahead
  type performance/read-ahead
  option page-size 65536
  option page-count 16
  subvolumes writeback
end-volume