Re: TCP-based NFS?

Bryn Paul Arnold Jones (
Fri, 6 Sep 1996 22:47:07 +0100 (BST)

On Thu, 5 Sep 1996, Taner Halicioglu wrote:

> Ok, so maybe this isn't the best place to ask this, but I've heard a few
> times about a rewrite of NFS taht uses TCP connections (I assume one per
> host machine mounting an NFS partition) rather than oh-so-yummy UDP...
> I am also assuming something like this would cut down a lot of the NFS
> overhead (since TCP takes care of the retransmits, etc that UDP has to do
> on a congested LAN) and speed things up -- as well as eliminate the
> wonderful 5 minute hang when your NFS server dies/goes out to lunch.

Hmm, well TCP has always been a can do this option for NFS implementers
AFAIK, but most don't support it, but I think on an uncongested ethernet the
TCP over head is much greater, hence UDP.

> ANYWAY, how much work has been done on this? Are there beta (alpha?)
> versions out? Has there been any work done from the "Linux end" or
> things?

Well if you can find a server that supports it, it should be no problem,
nfs(5) sais:
(mount) options section
tcp Mount the NFS filesystem using the TCP pro-
tocol instead of the default UDP protocol.
Many NFS severs only support UDP.

> Or, at least, does anyone know where I can find out more about it? :-) (is
> this TCP-based NFS == NFSv3 ?)

No, don't think so ...

> Thanks,
> -Taner

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