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Date:      Fri, 17 Sep 2010 14:57:38 +0200
From:      Michael Sperber <sperber@deinprogramm.de>
To:        freebsd-stable@FreeBSD.ORG
Subject:   Re: How to predict drive number change for 7.3->8.1 upgrade?
Message-ID:  <y9lr5gs7cjh.fsf@deinprogramm.de>
In-Reply-To: <201009171238.o8HCcwCl084727@lurza.secnetix.de> (Oliver Fromme's message of "Fri, 17 Sep 2010 14:38:58 %2B0200 (CEST)")
References:  <201009171238.o8HCcwCl084727@lurza.secnetix.de>

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Oliver Fromme <olli@lurza.secnetix.de> writes:

> Michael Sperber <sperber@deinprogramm.de> wrote:
>  > I just upgraded my desktop system from 7.3 to 8.1, and the main hard
>  > drive, which was /dev/ad6 before is now /dev/ad10.  Consequently, the
>  > initial boot failed when trying to mount the root file system from ad6.
>  > 
>  > The desktop system is now fixed, but I also have a rented server with
>  > only a serial console, and I worry that the upgrade is going to leave me
>  > with a dead machine.  Is there any way to predict how the drive number
>  > changes?  (Why does it change at all?)  If so, what's the proper way to
>  > tell the system the initial root device *before* rebooting?
>
> Remove "options ATA_STATIC_ID" from your kernel config
> before building the new kernel and rebooting.  Then your
> first disk will be ad0, no matter what controller and
> channel it is connected to.  Be sure to update your
> /etc/fstab file.

Ah, excellent - that's what I was looking for.  Thanks!

-- 
Regards,
Mike



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