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Date: Fri, 14 Oct 2005 20:37:10 +0200
From: Heinrich Rebehn <rebehn@ant.uni-bremen.de>
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To: Nicolas KOWALSKI <Nicolas.Kowalski@imag.fr>
References: <Pine.LNX.4.64.0510141021290.22064@corbeau.imag.fr>	<20051014160128.hev160v52ossokg0@wwws.cs.ait.ac.th>	<20051014045824.V5343@odysseus.silby.com>	<vqou0fkw92s.fsf@obiou.imag.fr>
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Cc: freebsd-fs@FreeBSD.org
Subject: Re: FreeBSD NFS server not responding to TCP SYN packets from
 Linux/SunOS clients
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Nicolas KOWALSKI wrote:
> Eric Anderson <anderson@centtech.com> writes:
> 
> 
>>Nicolas KOWALSKI wrote:
>>
>>>Eric Anderson <anderson@centtech.com> writes:
>>>
>>>
>>>>Nicolas KOWALSKI wrote:
>>>>
>>>>
>>>>>Mike Silbersack <silby@silby.com> writes:
>>>>>
>>>>>
>>>>>
>>>>>>Actually, there may be a quick fix for this specific machine.  If
>>>>>>you set net.inet.tcp.keepidle to 1 minute (60*whatever kern.hz
>>>>>>is), that'll cause keepalive packets to be sent every minute to
>>>>>>an idle connection, rather than every 2 hours.  That would kill
>>>>>>the stuck connections much quicker.
>>>
>>>>>Unfortunately, this does not work as expected. I just tested with
>>>>>my workstation (Linux 2.6), with NFS filesystems mounted with TCP;
>>>>>when the station rebooted abruptely, mounting the same NFS
>>>>>filesystems hung more than 1 minute (15 minutes just now). During
>>>>>this hang, I saw on the server, using netstat, the nfsd process
>>>>>related to my workstation in ESTABLISHED state.
>>>>
>>>>
>>>>Man fixmount?
>>>
>>>This is a FreeBSD-only command apparently. I did not find it on
>>>Linux or Solaris. It could have been useful, by calling it before
>>>NFS filesystems are mounted on clients, yes.
>>
>>It's available on Fedora Core 2 and 3 at least.
> 
> 
> So, its a non-option, because we are only using Debian Sarge and
> Solaris 9 UNIX workstations. :-(
> 

For Debian Sarge, it is in am-utils (amd automounter).
Since we are bit by the same problem - we have diskless Linux clients 
that mount their root fs from a FreeBSD server, which sometimes takes 
some 15 minutes - i will try fixmount next week.

--Heinrich