Not that I know of - most customers I assume never tweak the nfs.options.tcp - so run V3/UDP by default.
On a clean switched LAN I think you are fine.
In two cases where I saw massive packet loss on a high speed switched network, NFS/TCP was *much* worse than UDP - but both sucked. The TCP behaviour was continued slow start cycles.
However, NFS/TCP reduced cogestion.
But the real problem was broken hardware that had to be fixed. The network was unusable.
So for working high-speed switched LANs, UDP seems cool.
(blah, blah, blah)
Actually, I have one question: is there any reason we wouldn't want to start using NFSv3/UDP for Solaris boxes on our switched LAN?
- Dan