From owner-freebsd-fs@FreeBSD.ORG  Thu Nov 26 12:19:27 2009
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Date: Thu, 26 Nov 2009 14:19:18 +0200
From: Andriy Gapon <avg@icyb.net.ua>
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To: "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org>
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Cc: freebsd-fs <freebsd-fs@freebsd.org>
Subject: Re: kernel update svn 195757->199260, zpool.cache prevents boot
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on 26/11/2009 12:01 James R. Van Artsdalen said the following:
> I upgraded a ZFS system from svn 195757 to 199260 and it would not
> boot.  Booting from UFS reported a corrupt pool with many faulted
> devices and vdevs.
> 
> It turns out that the pool was fine and that zpool.cache was the
> problem: it was depending on the drive names being immutable but they
> changed between svn 195757 and 199260 for me (and will for many or most
> people 7.2->8.0 using the new AHCI driver)
> 
> Why not have GEOM record the ZFS GUID of each leaf dev when GEOM
> "tastes" the drive (similar to the way GEOM does that for UFS today),
> and then use the GUID field from zpool.cache to find the disk instead of
> the PATH field?  I don't see that ever failing.

Hmm, I thought that FreeBSD ZFS already did something like that.

-- 
Andriy Gapon