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Date: Tue, 1 Dec 2009 11:29:35 -0500
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From: Zaphod Beeblebrox <zbeeble@gmail.com>
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Cc: freebsd-fs@freebsd.org
Subject: Re: zfs/zpool upgrade
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2009/12/1 Gerrit K=FChn <gerrit@pmp.uni-hannover.de>

>
> I have one question concerning zfs and zpool upgrades:
>
> Some time ago I saw some postings here with procedures to upgrade to newe=
r
> zpool and zfs versions. These contained exporting and importing the pool
> (and upgrading in-between, of course :-).
> Is the export strictly neccessary? I have no machine where I could try it
> right now, but I think I did use zpool upgrade on imported and online
> pools before without noticing any problems.
>

I upgraded my ZFS pool and all that was required was "zpool upgrade"
followed by one "zfs upgrade" for each filesystem on the pool.  No
import/export was required.