Just wondering if you had the chance of testing the network speed with
iperf from host to host yet?
This is like the first thing to do while doing a full debug upside-down.
No matter what disks you have but note that each and one of them has a
maximum IOps limit which sometimes you can hit in a way.
as already suggested by others in the past you can use a binary search
dividing the issue one part at a time network.. disk.. controller..
driver.. software(since the software is proven to work).
Eliezer
On 06/12/2014 11:40 PM, Aronesty, Erik wrote:
I suspect I'm having performance issues because of network speeds.
/Supposedly/ I have 10gbit connections on all my NAS devices, however,
it seems to me that the fastest I can write is 1Gbit. When I'm copying
very large files, etc, I see 'D' as the cp waits to I/O, but when I go
the gluster servers, I don't see glusterfsd waiting (D) to write to the
bricks themselves. I have 4 nodes, each with 10Gbit connection, each
has 2 Areca RAID controllers with 12 disk raid5, and the 2 controllers
stripped into 1 large volume. Pretty sure there's plenty of i/o left
on the bricks themselves.
Is it possible that "one big file" isn't the right test… should I try 20
big files, and see how saturated my network can get?
Erik Aronesty
Senior Bioinformatics Architect
*EA | Quintiles
**/Genomic Services/**//*
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Durham, NC 27703 USA
Office: + 919.287.4011
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