[Lustre-discuss] OSS1 write performance impacted by OSS3 writes?!

Kevin Van Maren kevin.van.maren at oracle.com
Thu Oct 28 15:36:53 PDT 2010


Dan wrote:
> Hi,
>
> I have 4 OSSs with 4 OSTs each still running 1.6.7.2 on RHEL 4.  I 
> stripped files across OSTs specific to each OSS to test network 
> bandwidth.  Then wrote to each file from separate clients.  The 
> network is currently single GigE link to each OSS/client via Cisco 
> 4503.  Bonding 4 links to each OSS after resolving this current issue 
> I hope.
>
> Here's the problem.  When I start writing to OSS3 it cuts the 
> performance of OSS1 in half and only achieves half of it's network 
> bandwidth.  Stop writing to OSS1 and 3 gets full bandwidth or vice 
> versa.  If I write to OSS1,2 and 4 or OSS2,3,4 all get full bandwidth. 
>  I've checked what OSTs the files were stripped against and looked at 
> the network config.  Further more collectl shows no cross traffic (if 
> I had messed up file stripes).  No ideas...
>
> What could cause this?

Look at your Ethernet switch.

> Thanks,
>
> Dan
>
> -- Sent from my Palm Pre
>
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