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Date: Tue, 31 May 2011 19:38:50 +0200 (CEST)
From: Michael Reifenberger <mike@reifenberger.com>
To: pjd@freebsd.org
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Cc: Garrett Cooper <yanegomi@gmail.com>, FreeBSD-Current <current@freebsd.org>
Subject: Re: mount root from zfs fails under current with "error 6"
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Hi,

On Tue, 31 May 2011, Michael Reifenberger wrote:
...
> (fs)(root) gpart show ada0
> =>        34  5860533101  ada0  GPT  (2.7T)
>          34         990     1  freebsd-boot  (495k)
>        1024     2098176     2  freebsd-swap  (1.0G)
>     2099200  5858433928     3  freebsd-zfs  (2.7T)
>  5860533128           7        - free -  (3.5k)
>
...

maybe I found something:
After setting vfs.zfs.debug=1 I got two new verbose bootlogs:
 	http://people.freebsd.org/~mr/boot_fail2.txt
 	http://people.freebsd.org/~mr/boot_success2.txt

As you can see, in the failing case ZFS tries to attach to ada[0123]
whereas in the succeeding case ZFS attaches to ada[0123]p3 (which are the 
correct devices)

Bye/2
---
Michael Reifenberger
Michael@Reifenberger.com
http://www.Reifenberger.com