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hi Ray,<br>
Reads are served from the bricks which respond the fastest at the
moment. They are not load-balanced.<br>
<br>
Pranith<br>
<div class="moz-cite-prefix">On 08/08/2014 03:06 AM, Ray Mannings
wrote:<br>
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cite="mid:CABV57kuC8uUp=ys1HyO9Zp3ovBg3Cc2K5JAd=ODjHPYjJwJu1A@mail.gmail.com"
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<div>Hi,<br>
<br>
</div>
I have a small (5 node) compute cluster running an MPI job
that needs to read from a few 20 GB files. These files are
stored in a gluster volume composed of bricks from four
storage nodes. I originally made the volume with a replica
count of 2, but in an attempt to improve read performance,
I recreated it with a replica count of 4.<br>
<br>
</div>
However, reading turned out to be even slower! I checked out
disk access with iotop, and for one file, only two of the
bricks are being read from. For another file, only _one_
brick is accessed! Volume top read also shows the same
thing.<br>
<br>
</div>
What might be the problem? There are 40 threads across the
cluster trying to read at the same time; shouldn't this be
automatically load balanced across each brick?<br>
<br>
</div>
<div>Thanks,<br>
</div>
Ray<br>
</div>
<br>
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