Date: Fri, 14 Oct 2005 20:37:10 +0200 From: Heinrich Rebehn <rebehn@ant.uni-bremen.de> To: Nicolas KOWALSKI <Nicolas.Kowalski@imag.fr> Cc: freebsd-fs@FreeBSD.org Subject: Re: FreeBSD NFS server not responding to TCP SYN packets from Linux/SunOS clients Message-ID: <434FFAD6.6000002@ant.uni-bremen.de> In-Reply-To: <vqoll0w9ej5.fsf@corbeau.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> <434FD761.3050506@centtech.com> <vqopsq89euu.fsf@corbeau.imag.fr> <434FEDC6.4040405@centtech.com> <vqoll0w9ej5.fsf@corbeau.imag.fr>
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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
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