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<div class="moz-cite-prefix">On 01/12/2016 01:26 PM, Pawan Devaiah
wrote:<br>
</div>
<blockquote
cite="mid:CANF5f11bJf3nenL4c42a5XBFHT81VdEnv2hA0LnwOhjrn7Utnw@mail.gmail.com"
type="cite">
<div dir="ltr">Thanks for your response Pranith and Mathieu,
<div><br>
</div>
<div>Pranith: To answer your question, I am planning to use this
storage for two main workloads.</div>
<div><br>
</div>
<div>1. As a shared storage for VMs.</div>
</div>
</blockquote>
EC as it is today is not good for this.<br>
<blockquote
cite="mid:CANF5f11bJf3nenL4c42a5XBFHT81VdEnv2hA0LnwOhjrn7Utnw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>2. As a NFS Storage for files.</div>
</div>
</blockquote>
If the above is for storing archive data. EC is nice here.<br>
<br>
Pranith<br>
<blockquote
cite="mid:CANF5f11bJf3nenL4c42a5XBFHT81VdEnv2hA0LnwOhjrn7Utnw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div><br>
</div>
<div>We are a online backup company so we store few hundred
Terra bytes of data.</div>
<div><br>
</div>
<div><br>
</div>
<div>Mathieu: I appreciate your concern, however as a system
admins sometimes we get paranoid and try to control everything
under the Sun.</div>
<div>I know I can only control what I can.</div>
<div><br>
</div>
<div>Having said that, No, I have pair of servers to start with
so at the moment I am just evaluating and preparing for proof
of concept, after which I am going to propose to my
management, if they are happy then we will proceed further.</div>
<div><br>
</div>
<div>Regards,</div>
<div>Dev</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Jan 12, 2016 at 7:30 PM,
Mathieu Chateau <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:mathieu.chateau@lotp.fr" target="_blank">mathieu.chateau@lotp.fr</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hello,
<div><br>
</div>
<div>For any system, 36 disks raise disk failure
probability. Do you plan GlusterFS with only one server?</div>
<div><br>
</div>
<div>You should think about failure at each level and be
prepared for it:</div>
<div>
<ul>
<li>Motherboard failure (full server down)</li>
<li>Disks failure</li>
<li>Network cable failure <br>
</li>
<li>File system corruption (time needed for fsck)</li>
<li>File/folder removed by mistake (backup)</li>
</ul>
<div>Using or not raid depend on your answer on these
questions and performance needed. </div>
<div>It also depend how "good" is raid controller in
your server, like if it has battery and 1GB of cache.</div>
</div>
<div><br>
</div>
<div>When many disks are bought at same time (1 order,
serial number close to each other), they may fail in
near time to each other (if something bad happened in
manufactory).</div>
<div>I already saw like 3 disks failing in few days.</div>
<div><br>
</div>
<div>just my 2 cents,</div>
<div><br>
</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br clear="all">
<div>
<div>Cordialement,<br>
Mathieu CHATEAU<br>
<a moz-do-not-send="true" href="http://www.lotp.fr"
target="_blank">http://www.lotp.fr</a></div>
</div>
<div>
<div class="h5">
<br>
<div class="gmail_quote">2016-01-12 4:36 GMT+01:00
Pranith Kumar Karampuri <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:pkarampu@redhat.com"
target="_blank">pkarampu@redhat.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"><span> <br>
<br>
<div>On 01/12/2016 04:34 AM, Pawan Devaiah
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi All,
<div><br>
</div>
<div>We have a fairly powerful server
sitting at office with 128 Gig RAM and
36 X 4 TB drives. I am planning to
utilize this server as a backend storage
with GlusterFS on it.</div>
<div>I have been doing lot of reading on
Glusterfs, but I do not see any definite
recommendation on having RAID on GLUSTER
nodes.</div>
<div>Is it recommended to have RAID on
GLUSTER nodes specially for the bricks?</div>
<div>If Yes, is it not contrary to the
latest Erasure code implemented in
Gluster or is it still not ready for
production environment?</div>
<div>I am happy to implement RAID but my
two main concern are</div>
<div>1. I want to make most of the disk
space available.</div>
<div>2. I am also concerned about the
rebuild time after disk failure on the
RAID.</div>
</div>
</blockquote>
</span> What is the workload you have?<br>
<br>
We found in our testing that random read/write
workload with Erasure coded volumes is not as
good as we get with replication. There are
enhancements in progress at the moment to
address these things which we are yet to merge
and re-test.<br>
<br>
Pranith<br>
<blockquote type="cite">
<div dir="ltr">
<div><br>
</div>
<div>Thanks</div>
<div>Dev</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
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