Which is the correct way to configure translators? Should they all point
to one other volume (i.e. readahead, writebehind, io-cache, quick-read,
stat-prefetch should all have a "subvolumes replicate1" entry)?
Or rather, all subsequent volumes should point at each other?
1. Variant one - all point to "replicate1":
volume remote1
type protocol/client
option transport-type tcp
option remote-host alpha-int
option remote-subvolume brick
end-volume
volume remote2
type protocol/client
option transport-type tcp
option remote-host omega-int
option remote-subvolume brick
end-volume
volume replicate1
type cluster/replicate
option read-subvolume remote2
subvolumes remote1 remote2
end-volume
volume readahead
type performance/read-ahead
option page-count 16 # 2 is default option
option force-atime-update off # default is off
subvolumes replicate1
end-volume
volume writebehind
type performance/write-behind
option cache-size 128MB # default is equal to aggregate-size
option flush-behind on # default is 'off'
subvolumes replicate1
end-volume
volume io-cache
type performance/io-cache
option cache-size 1024MB # default is 32MB
option cache-timeout 4 # default is 1 second
subvolumes replicate1
end-volume
volume quick-read
type performance/quick-read
option cache-timeout 4
option max-file-size 1024000
subvolumes replicate1
end-volume
volume stat-prefetch
type performance/stat-prefetch
subvolumes replicate1
end-volume
2. Variant two - volumes point at each other (stat-prefetch ->
quick-read -> io-cache -> writebehind -> readahead -> replicate1).
volume remote1
type protocol/client
option transport-type tcp
option remote-host alpha-int
option remote-subvolume brick
end-volume
volume remote2
type protocol/client
option transport-type tcp
option remote-host omega-int
option remote-subvolume brick
end-volume
volume replicate1
type cluster/replicate
option read-subvolume remote2
# option favorite-child remote1
subvolumes remote1 remote2
end-volume
volume readahead
type performance/read-ahead
option page-count 16 # 2 is default option
option force-atime-update off # default is off
subvolumes replicate1
end-volume
volume writebehind
type performance/write-behind
option cache-size 128MB # default is equal to aggregate-size
option flush-behind on # default is 'off'
subvolumes readahead
end-volume
volume io-cache
type performance/io-cache
option cache-size 1024MB # default is 32MB
option cache-timeout 4 # default is 1 second
subvolumes writebehind
end-volume
volume quick-read
type performance/quick-read
option cache-timeout 4
option max-file-size 1024000
subvolumes io-cache
end-volume
volume stat-prefetch
type performance/stat-prefetch
subvolumes quick-read
end-volume
--
Tomasz Chmielewski
http://wpkg.org
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