From owner-freebsd-geom@FreeBSD.ORG  Wed Nov  5 16:55:12 2008
Return-Path: <owner-freebsd-geom@FreeBSD.ORG>
Delivered-To: freebsd-geom@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 73A731065680
	for <freebsd-geom@freebsd.org>; Wed,  5 Nov 2008 16:55:12 +0000 (UTC)
	(envelope-from marius@nuenneri.ch)
Received: from wa-out-1112.google.com (wa-out-1112.google.com [209.85.146.180])
	by mx1.freebsd.org (Postfix) with ESMTP id 53E9D8FC1C
	for <freebsd-geom@freebsd.org>; Wed,  5 Nov 2008 16:55:12 +0000 (UTC)
	(envelope-from marius@nuenneri.ch)
Received: by wa-out-1112.google.com with SMTP id m34so44078wag.27
	for <multiple recipients>; Wed, 05 Nov 2008 08:55:11 -0800 (PST)
Received: by 10.114.127.1 with SMTP id z1mr786474wac.10.1225904111805;
	Wed, 05 Nov 2008 08:55:11 -0800 (PST)
Received: by 10.114.38.10 with HTTP; Wed, 5 Nov 2008 08:55:11 -0800 (PST)
Message-ID: <b649e5e0811050855rd14434h32c1355bdbf6bf6b@mail.gmail.com>
Date: Wed, 5 Nov 2008 17:55:11 +0100
From: "=?ISO-8859-1?Q?Marius_N=FCnnerich?=" <marius@nuenneri.ch>
To: "Andriy Gapon" <avg@icyb.net.ua>
In-Reply-To: <4911C3E9.405@icyb.net.ua>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
References: <4911C3E9.405@icyb.net.ua>
Cc: freebsd-fs@freebsd.org, freebsd-geom@freebsd.org
Subject: Re: zfs: affected by geom_(mbr|bsd) => geom_part_(mbr|bsd) ?
X-BeenThere: freebsd-geom@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: GEOM-specific discussions and implementations
	<freebsd-geom.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-geom>
List-Post: <mailto:freebsd-geom@freebsd.org>
List-Help: <mailto:freebsd-geom-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 05 Nov 2008 16:55:12 -0000

On Wed, Nov 5, 2008 at 5:03 PM, Andriy Gapon <avg@icyb.net.ua> wrote:
>
> Using GENERIC amd64 7-BETA2 system (installed from "official" ISO) I
> partitioned my disk for ZFS root file system more or less as described here:
> https://ish.com.au/solutions/articles/freebsdzfs
>
> Big difference is that I created a separate slice to contain a partition
> for ZFS pool, so that ZFS pool is ad4s2d (and UFS2 boot is ad4s1a).
>
> Everything was fine, ZFS root was mounted as expected.
>
> Then I built a custom kernel with nooptions for GEOM_(BSD|MBR) and
> options for GEOM_PART_(BSD|MBR). When I tried to boot this kernel it
> couldn't mount ZFS root and I simply rebooted my machine when I stuck at
> mountroot prompt (I couldn't enter UFS2 root because of unrelated
> keyboard problem).
> The boot was verbose and I didn't see any peculiar GEOM or GEOM_PART
> messages (errors, warnings).
>
> I'll try to debug this further by booting into UFS root and running
> gpart, but I'd like to ask for an advice upfront.
>
> Can something like this be rationally expected?
> Is there a way to make ZFS see its pool again (when booted into UFS root)?

Afaict geom_part is a little bit more concerned about the correctness
of the partition tables. I think it's possible that you have a bug in
your tables which doesn't matter for geom_mbr or geom_bsd but for
geom_part.