[Gluster-users] Performance loss from 3.4.2 to 3.6.2

[ML mail]

Dear Pranith
I would be interested to know what the cluster.ensure-durability off option does, could you explain or point to the documentation?
RegardsML 

     On Thursday, February 12, 2015 8:24 AM, Pranith Kumar Karampuri <pkarampu at redhat.com> wrote:
   

 
On 02/12/2015 04:37 AM, Nico Schottelius wrote:
> Hello,
>
> switching from 3.4.2 to 3.6.2 reduces our average test performance dramatically.
>
> Our test setup: directly connected 1 GBit/s hosts setup with:
>
>      rm -rf /home/gluster/.glusterfs/
>      rm /home/gluster/*
>      setfattr -x trusted.glusterfs.volume-id  /home/gluster/
>      setfattr -x trusted.gfid /home/gluster/
>      gluster volume create xfs-plain replica 2 transport tcp vmhost1-cluster1:/home/gluster vmhost2-cluster1:/home/gluster
>      gluster volume start xfs-plain
>
> Afterwards we run our near real world test
>
>      mount -t glusterfs vmhost1-cluster1:/xfs-plain /mnt/gluster/
>      while true; do dd if=redmine-from-ceph-20150204 of=/mnt/gluster/testvm bs=1M; rm /mnt/gluster/testvm; done
>
> The results are
>
>      3.4.2: ~71-72 MiB/s    [ubuntu 14.04]
>      3.6.2: ~59-64 MiB/s    [gluster-3.6 ppa]
>
> We have removed 3.6.2 and re-installed 3.4.2 and can consistently reproduce
> these numbers over hours of testing.
Could you repeat the test on 3.6.2 with 'volume set <volname> 
cluster.ensure-durability off' option and post the results.

Pranith
>
> Is there any configuration change that we need to incorporate to run
> 3.6.2 faster or is this a known problem?
>
> Cheers,
>
> Nico
>

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