hi Ray,
Reads are served from the bricks which respond the fastest at the
moment. They are not load-balanced.
Pranith
On 08/08/2014 03:06 AM, Ray Mannings wrote:
Hi,
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 I originally made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.
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.
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?
Thanks,
Ray
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