[Gluster-users] Zero byte versions in DHT volume
Krishna Srinivas
krishna at gluster.com
Tue Jun 8 16:27:24 UTC 2010
Dan,
volume perseus
type protocol/client
option transport-type tcp
option remote-host perseus
option remote-port 6996
option remote-subvolume brick1
end-volume
volume romulus
type protocol/client
option transport-type tcp
option remote-host romulus
option remote-port 6996
option remote-subvolume brick1
end-volume
both volumes are pointing to brick1, hence the distribute sees the file twice.
On Tue, Jun 8, 2010 at 4:40 AM, Dan Bretherton <dab at mail.nerc-essc.ac.uk> wrote:
> Dear All,
>
> I have found a large number of files like the one below in a DHT volume.
>
> ---------T 1 nobody nobody 0 2010-05-01 18:34 d80bao.daj0710
>
> For those I have checked, a real file (i.e. non-zero size and normal
> permissions and ownership) exists on one brick and its zero byte counterpart
> is on one of the other bricks. I originally found these files by looking in
> the individual server bricks, but I discovered that I can also find them
> using the "find" command in the glusterfs DHT volume itself. However,
> listing a directory containing these files with "ls" does not list the zero
> byte versions, but instead two copies of the normal versions are shown.
> Does anybody have an idea what is going on? This strange behaviour is
> clearly going to confuse some users, and there are sometimes also long
> delays when listing the affected directories. I am using GlusterFS version
> 3.0.3 now but I also noticed this behaviour in 2.0.8. My client and server
> volume files are shown below.
>
> Regards,
> Dan Bretherton.
>
> #
> ##
> ### One of the server vol files ###
> ##
> #
> volume posix1
> type storage/posix
> option directory /local
> end-volume
>
> volume posix2
> type storage/posix
> option directory /local2/glusterfs
> end-volume
>
> volume posix3
> type storage/posix
> option directory /local3/glusterfs
> end-volume
>
> volume locks1
> type features/locks
> subvolumes posix1
> end-volume
>
> volume locks2
> type features/locks
> subvolumes posix2
> end-volume
>
> volume locks3
> type features/locks
> subvolumes posix3
> end-volume
>
> volume io-cache1
> type performance/io-cache
> subvolumes locks1
> end-volume
>
> volume io-cache2
> type performance/io-cache
> subvolumes locks2
> end-volume
>
> volume io-cache3
> type performance/io-cache
> subvolumes locks3
> end-volume
>
> volume writebehind1
> type performance/write-behind
> subvolumes io-cache1
> end-volume
>
> volume writebehind2
> type performance/write-behind
> subvolumes io-cache2
> end-volume
>
> volume writebehind3
> type performance/write-behind
> subvolumes io-cache3
> end-volume
>
> volume brick1
> type performance/io-threads
> subvolumes writebehind1
> end-volume
>
> volume brick2
> type performance/io-threads
> subvolumes writebehind2
> end-volume
>
> volume brick3
> type performance/io-threads
> subvolumes writebehind3
> end-volume
>
> volume server
> type protocol/server
> option transport-type tcp
> option auth.addr.brick1.allow *
> option auth.addr.brick2.allow *
> option auth.addr.brick3.allow *
> option listen-port 6996
> subvolumes brick1 brick2 brick3
> end-volume
>
> #
> ##
> ### Client vol file ###
> ##
> #
> volume remus
> type protocol/client
> option transport-type tcp
> option remote-host remus
> option remote-port 6996
> option remote-subvolume brick3
> end-volume
>
> volume perseus
> type protocol/client
> option transport-type tcp
> option remote-host perseus
> option remote-port 6996
> option remote-subvolume brick1
> end-volume
>
> volume romulus
> type protocol/client
> option transport-type tcp
> option remote-host romulus
> option remote-port 6996
> option remote-subvolume brick1
> end-volume
>
> volume distribute
> type cluster/distribute
> option min-free-disk 20%
> #option lookup-unhashed yes
> subvolumes remus perseus romulus
> end-volume
>
> volume writebehind
> type performance/write-behind
> subvolumes distribute
> end-volume
>
> volume io-threads
> type performance/io-threads
> subvolumes writebehind
> end-volume
>
> volume io-cache
> type performance/io-cache
> option cache-size 512MB
> subvolumes io-threads
> end-volume
>
> volume main
> type performance/stat-prefetch
> subvolumes io-cache
> end-volume
>
>
> --
> Mr. D.A. Bretherton
> Reading e-Science Centre
> Environmental Systems Science Centre
> Harry Pitt Building
> 3 Earley Gate
> University of Reading
> Reading, RG6 6AL
> UK
>
> Tel. +44 118 378 7722
> Fax: +44 118 378 6413
>
> _______________________________________________
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> Gluster-users at gluster.org
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>
>
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