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