Date: Tue, 15 Aug 2006 20:37:03 +0100 From: Brian Candler <B.Candler@pobox.com> To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Redundant/failover NFS servers - stale NFS file handle Message-ID: <20060815193703.GA91105@uk.tiscali.com> In-Reply-To: <6FAF95DA-76D5-4D72-A3C5-88AEA6F13267@mac.com> References: <200608141555.k7EFthXw092647@lurza.secnetix.de> <44E0C450.8050602@fsn.hu> <20060815122533.GB89848@uk.tiscali.com> <20060815123032.GR8503@catpipe.net> <6FAF95DA-76D5-4D72-A3C5-88AEA6F13267@mac.com>
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On Tue, Aug 15, 2006 at 11:20:47AM -0700, Chuck Swiger wrote: > On Aug 15, 2006, at 5:30 AM, Phil Regnauld wrote: > >Brian Candler (B.Candler) writes: > >>So to make an update, you would have to unmount from box 2, > >>remount RW on > >>box 1, make the change, remount RO on box 1, and mount RO again on > >>box 2. > > > > To make it short: if you want a reliable NFS head, you need NetApp. > > If you want to make failover, you'll need something like WAFL that > > has virtual inodes and allows for concurrent access from multiple > > writers. This is more of a freebsd-fs discussion. > > I think Solaris also makes a reliable NFS platform, and it even > supports failover and replication for read-only mounts. For read/ > write replicated filesystems, you're probably looking at AFS (Andrew > File System, but an opensource version is at www.openafs.org from > IBM, who apparently bought out Transarc) or maybe Coda. Hmm, I'm not sure I'd want to run Maildir on either of those, or at least Coda. When I looked at Coda, ISTR you could have conflicting updates in disconnected operation which required manual intervention to fix. Admittedly this was a few years ago, maybe things have moved on since then. Regards, Brian.
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