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Date: Fri, 16 Nov 2012 18:42:50 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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To: Niclas Zeising <zeising@daemonic.se>
Subject: Re: problem booting to multi-vdev root pool [Was: kern/150503: [zfs]
 ZFS disks are UNAVAIL and corrupted after reboot]
References: <509D1DEC.6040505@FreeBSD.org> <50A27243.408@madpilot.net>
 <50A65F83.5000604@FreeBSD.org> <50A66615.9060906@daemonic.se>
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Cc: Bartosz Stec <bartosz.stec@it4pro.pl>, freebsd-fs@FreeBSD.org,
 freebsd-current@FreeBSD.org, Guido Falsi <mad@madpilot.net>
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on 16/11/2012 18:13 Niclas Zeising said the following:
> Then I'm fine to update without issues. the problem is only if, as an example, you
> have a mirror with striped disks, or a stripe with mirrored disks, which it seems
> to me the original poster had.
> Am I correct, and therefore ok to update?

Yes.

The problem occurs only if your pool has multiple vdevs _immediately_ under root.

-- 
Andriy Gapon