From owner-freebsd-current@FreeBSD.ORG  Sun Aug 24 23:12:48 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id C8CF716A4BF
	for <freebsd-current@freebsd.org>;
	Sun, 24 Aug 2003 23:12:48 -0700 (PDT)
Received: from mailman.zeta.org.au (mailman.zeta.org.au [203.26.10.16])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 614E843FE1
	for <freebsd-current@freebsd.org>;
	Sun, 24 Aug 2003 23:12:47 -0700 (PDT)	(envelope-from bde@zeta.org.au)
Received: from gamplex.bde.org (katana.zip.com.au [61.8.7.246])
	by mailman.zeta.org.au (8.9.3p2/8.8.7) with ESMTP id QAA17673;
	Mon, 25 Aug 2003 16:12:31 +1000
Date: Mon, 25 Aug 2003 16:12:30 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
X-X-Sender: bde@gamplex.bde.org
To: Thomas Gutzler <giggel@hadiko.de>
In-Reply-To: <20030824232636.GC14668@brain.hadiko.de>
Message-ID: <20030825161221.U3593@gamplex.bde.org>
References: <20030824192611.GA14668@brain.hadiko.de>
	<20030824232636.GC14668@brain.hadiko.de>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: recover superblock
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 25 Aug 2003 06:12:48 -0000

On Mon, 25 Aug 2003, Thomas Gutzler wrote:

> Problem solved.
>
> I could restore the superblock using:
> dd if=<disk> skip=32 of=<disk> seek=16 bs=512 count=16
>
> Thx to
> http://groups.google.de/groups?selm=Pine.BSF.4.21.0212150052530.41793-100000_root.org%40ns.sol.net&oe=UTF-8&output=gplain

Not really solved.  fsck_ffs is supposed to be able to find alternative
superblocks automatically, and the primary superblock shouldn't get
trashed.  Apparently the first alternative is at offset 32 (this is
a normal place for it IIRC), but fsck_ffs can't find it there for
some reason.

Bruce