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<div class="moz-cite-prefix">On 01/13/2016 02:21 AM, Pawan Devaiah
wrote:<br>
</div>
<blockquote
cite="mid:CANF5f121UG2wemP5udJckz1nsmCQJPpazmg+6B3uqmO_GjcHbg@mail.gmail.com"
type="cite">
<div dir="ltr">Thanks for the response Pranith
<div><br>
</div>
<div>If we take EC out of the equation and say I go with RAID on
the physical disk, do you think GlusterFS is good for the 2
workloads that I mentioned before.</div>
<div><br>
</div>
<div>Basically it is going to be a NFS storage for VM and data
but with different RAIDs, 10 for VM and 6 for data.</div>
</div>
</blockquote>
What will be the kind of volume you will be using with these disks?<br>
<br>
Pranith<br>
<blockquote
cite="mid:CANF5f121UG2wemP5udJckz1nsmCQJPpazmg+6B3uqmO_GjcHbg@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>Thanks </div>
<div>Dev</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Jan 12, 2016 at 9:46 PM,
Pranith Kumar Karampuri <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:pkarampu@redhat.com"
target="_blank">pkarampu@redhat.com</a>></span> wrote:<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 class=""> <br>
<br>
<div>On 01/12/2016 01:26 PM, Pawan Devaiah wrote:<br>
</div>
<blockquote 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>
</span> EC as it is today is not good for this.<span
class=""><br>
<blockquote type="cite">
<div dir="ltr">
<div>2. As a NFS Storage for files.</div>
</div>
</blockquote>
</span> If the above is for storing archive data. EC is
nice here.<span class="HOEnZb"><font color="#888888"><br>
<br>
Pranith</font></span>
<div>
<div class="h5"><br>
<blockquote 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> <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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