From: "J. Bruce Fields" <bfields@fieldses.org>
To: Thomas Haynes <thomas@netapp.com>
Cc: DENIEL Philippe <philippe.deniel@cea.fr>, linux-nfs@vger.kernel.org
Subject: Re: Side effects of having NFSv4 mounted over udp
Date: Mon, 13 Dec 2010 14:16:35 -0500 [thread overview]
Message-ID: <20101213191634.GB2230@fieldses.org> (raw)
In-Reply-To: <A9F12BB4-8571-4C58-AC6A-8094FA912B27@netapp.com>
On Mon, Dec 13, 2010 at 01:04:28PM -0600, Thomas Haynes wrote:
>
> On Dec 13, 2010, at 1:46 AM, DENIEL Philippe wrote:
>
> > Hi,
> >
> > I know NFSv4 is definitely a connection oriented protocol, but noting prevent from using "mount -t nfs4 -o proto=udp <...>". Using TCP instead of UDP could be of great interest, especially in a HPC context where thousands of clients will operate at the same time. If a nfs mount point is made over udp, what would be the side effects ? I tried to run the connectathon on such a udp based mount point and I could find no errors. Is NFSv4/UDP a suitable solution ? Or does it make no sense to use udp ?
>
>
> You might find that some implementations have UDP disabled and it might then make
> it hard to triage what is going on.
>
> I believe both NetApp's OnTap and Oracle's Solaris have it turned off.
The Linux server allows it, but I've been considering that a
(low-priority) bug, so it wouldn't be safe to assume it will continue
working.
That aside, if you have a perfect network, NFSv4.0 at least will
probably work. (Not 4.1 since backchannel setup will fail?)
Are you really sure that you can't make tcp scale to thousands of
clients?
--b.
>
>
> >
> > Thanks in advance for your answer.
> >
> > Regards
> >
> > Philippe
> > --
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next prev parent reply other threads:[~2010-12-13 19:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-13 7:46 Side effects of having NFSv4 mounted over udp DENIEL Philippe
2010-12-13 19:04 ` Thomas Haynes
2010-12-13 19:16 ` J. Bruce Fields [this message]
2010-12-13 19:47 ` Trond Myklebust
2010-12-14 7:35 ` DENIEL Philippe
2010-12-14 19:15 ` J. Bruce Fields
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