From owner-freebsd-questions@FreeBSD.ORG  Thu Oct 15 18:22:34 2009
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Date: Thu, 15 Oct 2009 12:22:29 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: PJ <af.gourmet@videotron.ca>
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	(wonkity.com [127.0.0.1]); Thu, 15 Oct 2009 12:22:29 -0600 (MDT)
Cc: Polytropon <freebsd@edvax.de>, freebsd-questions@freebsd.org
Subject: Re: booting from wrong disk
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On Thu, 15 Oct 2009, PJ wrote:

> While trying to learn and understand the dump-retore process, I messed
> up the ad4s1a partition and could not boot. To fix it I restored a
> dumpfile of ad12s1a which is, for all intents and purposes, the same as
> ad4s1a. I then boot from ad4 and surprise, surprise...
> #df shows we have been booted from ad12 and all partitions are ad12....
> Booting from ad12s1a gives exactly the same results.

The /etc/fstab from ad12 will point at ad12.  After restoring on ad4, 
did you edit fstab to now have ad4 entries?

-Warren Block * Rapid City, South Dakota USA