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<p>The current sharding has very limited use cases like vmstore
where the clients accessing the sharded file will always be one.
Krutuka will be the right person to answer your questions .</p>
<p><br>
</p>
<p>Regards</p>
<p>Rafi KC<br>
</p>
<br>
<div class="moz-cite-prefix">On 06/30/2017 04:28 PM,
<a class="moz-txt-link-abbreviated" href="mailto:gencer@gencgiyen.com">gencer@gencgiyen.com</a> wrote:<br>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have an 2 nodes with 20 bricks in total
(10+10).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">First test: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">2 Nodes with Distributed – Striped –
Replicated (2 x 2)<o:p></o:p></p>
<p class="MsoNormal">10GbE Speed between nodes<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">“dd” performance: 400mb/s and higher<o:p></o:p></p>
<p class="MsoNormal">Downloading a large file from internet and
directly to the gluster: 250-300mb/s<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Now same test without Stripe but with
sharding. This results are same when I set shard size 4MB or
32MB. (Again 2x Replica here)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dd performance: 70mb/s<o:p></o:p></p>
<p class="MsoNormal">Download directly to the gluster
performance : 60mb/s<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Now, If we do this test twice at the same
time (two dd or two doewnload at the same time) it goes below
25/mb each or slower.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I thought sharding is at least equal or a
little slower (maybe?) but these results are terribly slow.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I tried tuning (cache, window-size etc..).
Nothing helps.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">GlusterFS 3.11 and Debian 9 used. Kernel
also tuned. Disks are “xfs” and 4TB each.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is there any tweak/tuning out there to make
it fast?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Or is this an expected behavior? If its, It
is unacceptable. So slow. I cannot use this on production as
it is terribly slow. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The reason behind I use shard instead of
stripe is i would like to eleminate files that bigger than
brick size.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Gencer.<o:p></o:p></p>
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