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Date: Sun, 17 Jan 2010 09:04:16 -0600 (CST)
From: Wes Morgan <morganw@chemikals.org>
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To: Volodymyr Kostyrko <c.kworr@gmail.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: AHCI and ZFS: root mount error
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On Sat, 16 Jan 2010, Volodymyr Kostyrko wrote:

> On Sat, 16 Jan 2010 00:29:23 +0100
> Oliver Brandmueller <ob@e-Gitt.NET> wrote:
>
> > Check with "zpool status" if your zpool refers to diskslices like
> > "ad0s1". I use gpt have setup the ZFS mirror to refer to gptids:
> >
> >   pool: silver
> >  state: ONLINE
> >  scrub: none requested
> > config:
> >
> >         NAME                                            STATE     READ WRITE CKSUM
> >         silver                                          ONLINE       0     0     0
> >           mirror                                        ONLINE       0     0     0
> >             gptid/9e68d234-f306-11de-a0c4-0002b3b6e838  ONLINE       0     0     0
> >             gptid/a025b88c-f306-11de-a0c4-0002b3b6e838  ONLINE       0     0     0
> >
> > With that kind of configuration I can switch back and forth between
> > using ATA_CAM or using traditional ATA drivers. Since you're not using
> > GPT I gues you can use geom labels to do more or less the same thing.
> >
> > In short: use labels, nut device names. Saves headaches in many cases.
>
> ZFS actually can find disks without any glabel help. I have one server
> which I have moved recently to ahci and nothing changes for me. ZFS
> silently accepted new provider names and continue working as usual.
>

Agreed, I experienced the same thing here when I moved to AHCI. I think
pjd committed some changes in the last few months that greatly improved
the ability of zfs to find devices by uuid. Using glabel or gptid's
with zfs is highly overrated IMO!