From: John Goerzen <jgoerzen@complete.org>
Subject: Live performance tools?
Date: Mon, 13 Aug 2007 16:25:28 -0500
Message-ID: <slrnfc1j28.fcc.jgoerzen@katherina.lan.complete.org>
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To: nfs@lists.sourceforge.net
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Hi,

We are deploying a number of Linux desktop clients running NFS against
our Linux NFS server.  We are seeing occasional odd spikes in traffic
that are causing performance troubles for all users.  We are trying to
isolate the cause of these spikes, but to date haven't been able to.
The best we can do is use iostat and verify that yes, the disk we
expected is seeing a lot of traffic.

nfsd threads seem to be impervious to lsof.  top also doesn't show much
about them, and of course you can't strace them.

Is there any tool out there that could give us any of this sort of info:

 * What IP addresses are generating high volumes of read or write
   traffic

 * What files on disk are being accessed frequently via NFS

 * Anything else that could help us pinpoint the trouble

nfsstat does not seem to provide fine enough detail for this.

Thanks,

-- John


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