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We've continued using the 128KB stripes to the disks. The
performance dropoff going from 8+2 128KB to 10+2 128KB was
measurable but not a game-changer for us, particularly as the
filesystems that are using 10+2 are mixed-use rather than HPC
scratch.<br>
<br>
I'm not sure if we tested using larger stripe sizes on the 10+2
arrays to see if performance got any better. Do you have any test
results on 10+2 128KB vs 10+2 256KB?<br>
<pre class="moz-signature" cols="72">Andrew Wagner
Research Systems Administrator
Space Science and Engineering
University of Wisconsin
<a class="moz-txt-link-abbreviated" href="mailto:andrew.wagner@ssec.wisc.edu">andrew.wagner@ssec.wisc.edu</a> | 608-261-1360
</pre>
<div class="moz-cite-prefix">On 04/28/2015 08:59 PM, Nguyen Viet
Cuong wrote:<br>
</div>
<blockquote
cite="mid:CABfy26iOmstLe+D4i1Kagc7LBgBjY-Qh3drqU-Jga7r_9h+W9g@mail.gmail.com"
type="cite">
<div dir="ltr">We normally use 8+2 in RAID6 with 128KB chunk.
<div><br>
</div>
<div>Andrew, what is stripe size in case of your 10+2 config?
Sometime I use 256KB to make it 2.5MB stripe because I think
1.25MB is unreasonable.</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Apr 29, 2015 at 5:35 AM, Andrew
Wagner <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:andrew.wagner@ssec.wisc.edu" target="_blank">andrew.wagner@ssec.wisc.edu</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"> We try to do 8+2
where it's convenient, but when we end up with 12 disk
raid arrays in some places we do 10+2.<span class="HOEnZb"><font
color="#888888"><br>
<pre cols="72">Andrew Wagner
Research Systems Administrator
Space Science and Engineering
University of Wisconsin
<a moz-do-not-send="true" href="mailto:andrew.wagner@ssec.wisc.edu" target="_blank">andrew.wagner@ssec.wisc.edu</a> | 608-261-1360
</pre>
</font></span>
<div>
<div class="h5">
<div>On 04/28/2015 03:01 PM, Andrus, Brian Contractor
wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div class="h5">
<div>
<p class="MsoNormal">Quick question/survey:</p>
<p class="MsoNormal">What is the partition size
folks use for their OSTs and why?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="color:#1f497d">Brian
Andrus</span></p>
<p class="MsoNormal"><span style="color:#1f497d">ITACS/Research
Computing</span></p>
<p class="MsoNormal"><span style="color:#1f497d">Naval
Postgraduate School</span></p>
<p class="MsoNormal"><span style="color:#1f497d">Monterey,
California</span></p>
<p class="MsoNormal"><span style="color:#1f497d">voice:
831-656-6238</span></p>
<p class="MsoNormal"> </p>
</div>
<br>
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<br>
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-- <br>
<div class="gmail_signature">Nguyen Viet Cuong<br>
</div>
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