Date: Mon, 14 Dec 1998 17:00:55 -0700 (MST) From: "David G. Andersen" <danderse@cs.utah.edu> To: Alfred Perlstein <bright@hotjobs.com> Cc: spork <spork@super-g.com>, Bernd Walter <ticso@cicely.de>, Kevin Day <toasty@home.dragondata.com>, hackers@FreeBSD.ORG Subject: Re: NFS thoughts Message-ID: <13941.42539.360724.653774@torrey.cs.utah.edu> In-Reply-To: Alfred Perlstein's message of Mon, December 14 1998 <Pine.BSF.4.05.9812141150391.27793-100000@bright.fx.genx.net> References: <Pine.BSF.4.00.9812141110220.28944-100000@super-g.inch.com> <Pine.BSF.4.05.9812141150391.27793-100000@bright.fx.genx.net>
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Lo and Behold, Alfred Perlstein said:
> >
> > I also haven't seen the "I've mounted soft and intr, yet things still
> > hang" behaviour using version 2 and udp. Any consensus on that?
>
> why would you mount _both_ soft and intr? to me they seem mutually
> exclusive.
>
> 'intr' allows you to intrupt a hung NFS proc so that it recives a
> transient error on a filesystem call, the process will hang forever unless
> NFS comes back, or you ^C it
>
> 'soft' automates that with a timeout however signals won't work, but after
> some time the process will unhang and get an error on the filesystem call.
>
> Are you trying to get an auto-timeout like mount with that ability to ^C?
>
> generally intr is best, the idea of many processes timeing out on NFS
> mounts should the server crash, makes my stomach turn.
Note that until kern/8732 is fixed, this can be dangerous (hang
your machine dangerous). Mounting with 'intr' and then sending
SIGINTR while a process is attempting to flush a dirty block will
cause the machine to wedge.
-Dave
--
work: danderse@cs.utah.edu me: angio@pobox.com
University of Utah http://www.angio.net/
Department of Computer Science
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