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Date: Thu, 21 May 2009 11:15:18 +0300
From: Danny Braniss <danny@cs.huji.ac.il>
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Cc: freebsd-stable@freebsd.org
Subject: Re: ZFS MFC heads up 
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> I will be MFC'ing the newer ZFS support some time this afternoon. Both
> world and kernel will need to be re-built. Existing pools will
> continue to work without upgrade.
> 
> 
> If you choose to upgrade a pool to take advantage of new features you
> will no longer be able to use it with sources prior to today. 'zfs
> send/recv' is not expected to inter-operate between different pool
> versions.

I think this is not a zfs issue, but it does trigger the problem:
on a zfs mounted system via nfs, from linux, an ls .zfs 
used to panic the server, now it just doesn't work :-).
(http://lists.freebsd.org/pipermail/freebsd-fs/2008-October/005217.html)

so is this being worked on?

btw, i will be trying the new version over the weekend.

danny