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<p>Hi Benjamin,</p>
<p><br>
</p>
<p>Can you tell us more about your work-load like the file size,
size of both hot and cold storage, how the files are created
(after attaching the tier or before attaching the tier) , how long
have you been using the tier volume, etc.</p>
<p><br>
</p>
<p>Regards</p>
<p>Rafi KC<br>
</p>
<p><br>
</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 09/03/2016 09:16 AM, Benjamin
Kingston wrote:<br>
</div>
<blockquote
cite="mid:CAHA1JWKJrwgdkqrsG_-y3Ogp1dhrseq_vND4_NG=5Wsp3U2vRw@mail.gmail.com"
type="cite">
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<div class="gmail_quote">
<div dir="ltr">Hello all,
<div><br>
</div>
<div>I've discovered an issue in my lab that went unnoticed
until recently, or just came about with the latest Centos
release.</div>
<div><br>
</div>
<div>When the SSD hot tier is enabled read from the volume
is 2MB/s, after detaching AND committing, read of the same
file is at 150MB/s to /dev/null</div>
<div><br>
</div>
<div>If I copy the file to the hot bricks directly the write
is 150MB/s and read is 500MB/s on the first read, and then
4GB/s on the subsequent reads (filesystem RAM caching) to
/dev/null</div>
<div><br>
</div>
<div>Just enabling tier storage takes the performance to
~10-20IOPS and 2-10MB/s even for local node mounted
volume.</div>
<div><br>
</div>
<div>I don't see any major log issues and I detached and did
a fix-layout, but it persists when re-enabling the tier.</div>
<div><br>
</div>
</div>
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