Date: Wed, 6 Jan 2010 15:58:05 -0500 (EST) From: Rick Macklem <rmacklem@uoguelph.ca> To: alan bryan <alan.bryan@yahoo.com> Cc: freebsd-stable@freebsd.org Subject: Re: Zombie NFS writing from FreeBSD clients to FreeBSD 8.0 server with ZFS Message-ID: <Pine.GSO.4.63.1001061556090.2599@muncher.cs.uoguelph.ca> In-Reply-To: <700718.76026.qm@web50501.mail.re2.yahoo.com> References: <700718.76026.qm@web50501.mail.re2.yahoo.com>
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On Wed, 6 Jan 2010, alan bryan wrote: > I have a AMD64 FreeBSD 8.0 server with ZFS filesystem being shared via NFS. These are being accessed by the clients. The clients are a mix of FreeBSD 6.2 32bit and FreeBSD 7.0 64bit. I have seen similar behavior from both versions of FreeBSD as clients. > > The behavior that I'm seeing is that everything is fine for a period of time and then the client starts "writing" large amounts of data to the NFS server. "Writing" is in quotes as nothing is actually being written to disk - this can go on for 12+ hrs or more - until the client is rebooted. It appears to cap out at around the 10-20Mbps rate and just sit there. Other clients are fine during this time. > > > Client mounts in /etc/fstab look like: > 192.168.1.33:/tank/share /usr/local/www/share nfs rw,-b,-i,-U,-3 0 0 > One other thing you could try is switching to TCP mounts (replace -U with -T). There are a couple of others that have reported NFS server problems (all different symptoms) where the problem went away when they switched to TCP. rick
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