[Lustre-discuss] Line rate performance for clients

[Colin Faber]

Try testing it with lnet self test and see what kind of results you see.

-cf


On 07/29/2011 11:33 AM, Brock Palen wrote:
> I think this is a networking question.
>
> We have lustre 1.8 clients with 1gig-e interfaces that according to ethtool are running full duplex.
>
> If I do the following:
>
> cp /lustre/largeilfe.h5 /tmp/
>
> I get 117MB/s
>
> If I then use globus-url-copy to move that file from /tmp/ to ->  remove tape archive I get 117MB/s
>
> If I go directly from  /lustre ->  archive  I get 50MB/s,
>
> this is consistently reproducible.  It doesn't mater if I just copy a large file on lustre to lustre,  or scp, or globus.  If I try to ingest and outgest data I get what looks like half duplex performance.
>
> Anyone have ideas why I cannot do 1Gig-e full duplex?
>
> Brock Palen
> www.umich.edu/~brockp
> Center for Advanced Computing
> brockp at umich.edu
> (734)936-1985
>
>
>
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