From: "Lever, Charles" <Charles.Lever@netapp.com>
Subject: RE: NAS server avalanche overload
Date: Wed, 3 Mar 2004 18:07:14 -0800
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <482A3FA0050D21419C269D13989C61130435DCCE@lavender-fe.eng.netapp.com>
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Cc: <nfs@lists.sourceforge.net>
To: "Greg Banks" <gnb@melbourne.sgi.com>,
        "Erik Walthinsen" <omega@pdxcolo.net>
Errors-To: nfs-admin@lists.sourceforge.net

> > > The noatime option has no effect over NFS.  Your [rw]sizes are
> > > really quite small, try 8K.  Also, try turning off noac.
> > The rwsizes were set based on a set of experiments with=20
> different sizes,
> > with 4k yielding by far the best bandwidth performance. =20
> The limiting
> > factor there is that the gig switch we have atm doesn't handle jumbo
> > frames.=20
>=20
> That really shouldn't make a difference; both 4K and 8K IOs will end
> up being split over multiple ethernet frames.

it does make a difference if you are using UDP and your network
suffers from bursty congestion or buffer overruns.

erik, you should look for network problems so you can boost your
transfer size without suffering a loss in performance.


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