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<div class="moz-cite-prefix">On 04/03/2015 11:45 AM, Bill Dossett
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Thanks for your
response. My actual need here is to familiarize myself with
Gluster…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">This is really
a lab project for me to try and get as much experience with
GlusterFS as I can to see what use it might be.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I’ve done some
thinking and I am going to use the two hosts with 146GB
disks in for my oVirt cluster now.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">So I am using
the 2 x Dell 2950s with 6 x 300GB disks in each for my
Gluster.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">So my needs now
would be that I want as much storage – but able to lose a
disk and not lose data, so not RAID 0.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">So could you
tell me if there are advantages or disadvantages to creating
a RAID5 out of the 6 x 300 GB disks on each 2950 server and
then allocate whatever is left after loading the operating
system and Gluster as a brick? Or not create RAID and use
each disk as brick. I expect creating the RAID as the Dell
Perc controller is pretty efficient would be better than
software defined RAID – for performance anyway?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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</blockquote>
<br>
Replication adds fault tolerance, so with replication, raid is often
overkill. Use the standard <a
href="http://www.eventhelix.com/realtimemantra/faulthandling/system_reliability_availability.htm">reliability
calculations</a> to determine if replication alone will meet your
SLA/OLA requirements (when/if you have some). The nice thing about
replication vs raid is that with replication you can lose virtually
(or literally if designed that way) any piece of hardware and still
have access to your data.<br>
<br>
You may wish to do some raid 0 or raid 1+0 to get enough disk
throughput to keep up with your network, depending on each, of
course.<br>
<br>
Personally, I never do raid 5. The reliability cost vs the cost of
storage is just too high for my tastes even if the performance hit
wasn't important to my use case.<br>
<br>
<blockquote
cite="mid:B47F00825D68444ABC03733078275360377A7866@013-BR1MPN1-011.MGDPBI.global.pvt"
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<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Thanks again, I
really appreciate the advice.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
style="color:windowtext;mso-fareast-language:EN-GB"
lang="EN-US">From:</span></b><span
style="color:windowtext;mso-fareast-language:EN-GB"
lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:gluster-users-bounces@gluster.org">gluster-users-bounces@gluster.org</a>
[<a class="moz-txt-link-freetext" href="mailto:gluster-users-bounces@gluster.org">mailto:gluster-users-bounces@gluster.org</a>]
<b>On Behalf Of </b>Joe Julian<br>
<b>Sent:</b> 03 April 2015 12:30<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:gluster-users@gluster.org">gluster-users@gluster.org</a><br>
<b>Subject:</b> Re: [Gluster-users] newbie quick
question<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">imho, start by
defining your needs then design the system to meet them. The
only goal set out below is that you, "want to get as much
storage out of these as possible." This would mean raid0 or 1
brick per disk with a distribute array (no replication).<br>
<br>
Identically sized bricks are best. Often if the disk sizes are
mixed, raid or partitioning are used to create bricks of the
same size.<span
style="font-size:12.0pt;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<div>
<p class="MsoNormal">On 04/03/2015 09:36 AM, Bill Dossett
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi, this is my first attempt at Gluster
storage.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Just a quick help me get started question
– the bare metal page yields a “not found” on the web site
so…<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I have two dell 2950s fully populated
with 5 x 300GB 10K disks.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I want to get as much storage out of
these as possible.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I have two more dell 2950s each with 4 x
146GB 10K disks.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Should I build one RAID 5 container on
the first two servers, load up CentOS7 and then Gluster on
that? using the unused partition of what is left after
loading CentOS?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Or should I be looking at moving physical
disks around and putting the smaller 146 GB disks as RAID 1
in each of the 4 servers for OS and distributing the 300GB
disks amoung all the servers and maybe pick some more up on
Ebay to get all 4 servers identical?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Would appreciate any advice on short
notice as I have nothing else to do today for once and would
just as soon at least start off on the right foot!<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span
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Dossett</span></b><o:p></o:p></p>
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style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:EN-GB">Systems
Architect</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:EN-GB">Tech
Central – Global Engineering Services</span></b><o:p></o:p></p>
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<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Gluster-users mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:Gluster-users@gluster.org">Gluster-users@gluster.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://www.gluster.org/mailman/listinfo/gluster-users">http://www.gluster.org/mailman/listinfo/gluster-users</a><o:p></o:p></pre>
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