From owner-freebsd-net@FreeBSD.ORG  Tue Aug 15 19:37:24 2006
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Date: Tue, 15 Aug 2006 20:37:03 +0100
From: Brian Candler <B.Candler@pobox.com>
To: Chuck Swiger <cswiger@mac.com>
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Cc: freebsd-net@FreeBSD.ORG
Subject: Re: Redundant/failover NFS servers - stale NFS file handle
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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.