[CentOS] [Gluster-users] performance due to network?

Fri Jun 13 16:17:04 UTC 2014
Eliezer Croitoru <eliezer at ngtech.co.il>

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).


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
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