[Lustre-discuss] IOR performance - Need help

Brian J. Murrell brian.murrell at oracle.com
Tue Sep 14 06:49:40 PDT 2010

On Tue, 2010-09-14 at 04:20 -0700, satish patil wrote: 
> Thanks for your feedback. Back end storage P2000 G3 which is SAS based - 8 Gbps SAN using 450GB-15K.  It is clients requirement to have performanace with Single file using all OST's. 

As fanyong said, you need to step back from doing lustre end-to-end
testing and verify the performance of your components with the iokit.

The lustre-iokit has various benchmark tools in it to test first your
raw storage as individual units.  Once you have done that and verified
that your storage hardware is capable of the performance you are looking
for, you can move on to the next benchmark which will test your storage
in aggregate to reveal any bottlenecks.  Once that has met your
expectations you can benchmark the network->storage pipeline with a
different tool.

It is only through this methodological, step-by-step process that you
are going to figure out if your hardware is truly capable of the
performance you desire and if not, find out exactly where your
bottleneck is.


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