Date: Tue, 31 Jan 2012 00:29:26 -0500 (EST) From: Rick Macklem <rmacklem@uoguelph.ca> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-fs@freebsd.org Subject: Re: Is doing mount -u -o udp useful for you on an NFS mount? Message-ID: <1413501962.445071.1327987766416.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <20120126082208.GA49394@icarus.home.lan>
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Jeremy Chadwick wrote: > On Wed, Jan 25, 2012 at 11:01:41PM -0500, Rick Macklem wrote: > > Using a "mount -u" to change from TCP to UDP for an > > NFS mount is somewhat broken for both NFS clients. > > To make it work correctly is not trivial. > > > > As such, I'd like to find out if anyone needs this > > capability? (Note, I am not talking about UDP mounts > > in general, just the case of switching a TCP mount to > > a UDP mount without doing an unmount/mount.) > > I've never seen any SAN admin do this, even on our production server > at > work (Solaris with a NetApp SAN). When it comes to NFS, the moral of > the story is always "reboot the machine" (which is good anyway, make > sure everything comes up on boot, else months from now you'll find out > the hard way). > > However, to squelch people from doing it, could mount_nfs(8) actually > be > modified to spit out a nastygram when someone attempts to do this, so > at > least the admin would know that such isn't supported due to the > extreme > complexities involved? > I've just committed a patch that sends a log warning message when someone does this. Thanks for the suggestion, rick
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