*BSD News Article 90873


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From: dillon@flea.best.net (Matt Dillon)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: NFS struggles
Date: 12 Mar 1997 13:20:26 -0800
Organization: BEST Internet Communications, Inc.
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Message-ID: <5g76mq$6hl@flea.best.net>
References: <5flph7$dmb@delphi.cs.ucla.edu> <5g1n68$sqr@news.aero.org> <Pine.OSF.3.95.970310153518.2362A-100000@alpha1.phoenix.net> <u7g1y1rlfm.fsf@japonica.csl.sri.com>
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Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:36923

:In article <u7g1y1rlfm.fsf@japonica.csl.sri.com>,
:Fred Gilham  <gilham@japonica.csl.sri.com> wrote:
:>
:>
:>>(Problem with FreeBSD NFS client hanging on mounts from multi-homed
:>>file servers)
:>
:>I just found that the problem doesn't occur if you use TCP-NFS
:>instead of UDP.  However, this only works for servers that support NFS
:>using TCP.
:>
:>-- 
:>-Fred Gilham    gilham@csl.sri.com

    TCP NFS mounts should be outlawed.  They are NOT stable.  I can't tell
    you how many times I have crashed machines trying to use TCP NFS
    mounts.   In fact, we try to avoid NFS alltogether these days... it's
    much better to run the disks local and get 20 times the I/O bandwidth
    then to run it over a network, even a 100BaseT network.  A modern
    PCI SCSI controller and an ultra controller will do 40 MBytes/sec
    to the SCSI bus.  I have *tested* that... it really can do 40 Mbytes/sec
    to multiple disks in parallel.

					-Matt