[Gluster-users] DISPERSED VOLUME

[Serkan Çoban]

I think you should try with a bigger file.1,10,100,1000KB?
Small files might just being replicated to bricks...(Just a guess..)

On Fri, Nov 25, 2016 at 12:41 PM, Alexandre Blanca
<alexandre.blanca at inria.fr> wrote:
> Hi,
>
> I am a beginner in distributed file systems and I currently work on
> Glusterfs.
> I work with 4 VM : srv1, srv2, srv3 and cli1
> I tested several types of volume (distributed, replicated, striped ...)
> which are for me JBOD, RAID 1 and RAID 0.
> When I try to make a dispersed volume (raid5 / 6) I have a misunderstanding
> ...
>
>
> gluster volume create gv7 disperse-data 3 redundancy 1
> ipserver1:/data/brick1/gv7 ipserver2:/data/brick1/gv7
> ipserver3:/data/brick1/gv7 ipserver4:/data/brick1/gv7
>
>
> gluster volume info
>
>
> Volume Name: gv7
> Type: Disperse
> Status: Created
> Number of Bricks: 4
> Transport-type: tcp
> Bricks:
> Brick1: ipserver1:/data/brick1/gv7
> Brick2: ipserver2:/data/brick1/gv7
> Brick3: ipserver3:/data/brick1/gv7
> Brick4: ipserver4:/data/brick1/gv7
>
> gluster volume start gv7
>
>
> mkdir /home/cli1/gv7_dispersed_directory
>
>
> mount -t glusterfs ipserver1:/gv7 /home/cli1/gv7_dispersed_directory
>
>
>
> Now, when i create a file on my moint point (gv7_dispersed_directory) :
>
>
> cd /home/cli1/gv7_dispersed_directory
>
>
> echo 'hello world !' >> test_file
>
>
> I can see in my srv1 :
>
>
> cd /data/brick1/gv7
>
>
> cat test
>
>
> hello world !
>
>
> in my srv2 :
>
>
>
> cd /data/brick1/gv7
>
>
>
> cat test
>
>
>
> hello world !
>
>
> in my srv4:
>
>
>
> cd /data/brick1/gv7
>
>
>
> cat test
>
>
>
> hello world !
>
>
> but in my srv3 :
>
>
>
> cd /data/brick1/gv7
>
>
>
> cat test
>
>
>
> hello world !
>
> hello world !
>
>
> Why?! output of server 3 displays 2 times hello world ! Parity? Redundancy?
> I don't know...
>
> Best regards
>
> Alex
>
>
>
>
>
>
>
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