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Date: Mon, 29 Nov 2010 12:32:32 -0600
From: "James R. Van Artsdalen" <james@jrv.org>
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To: "O. Hartmann" <ohartman@zedat.fu-berlin.de>
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Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: CURRENT: Issue with ZFS and 2TB WD HDD (WDC
	WD20EURS-63Z9B1	80.00A80)
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O. Hartmann wrote:
> Attached to the system are three WD harddrives with ZFS as filesystem
> on GPT partitioning scheme.

Please send the output of "camcontrol devlist" and "zpool status" on
FreeBSD-8.1.  Then export the pool in FreeBSD-8.1, boot FreeBSD-9 with
verbose booting and send the output of "camcontrol devlist", "zpool
import BACKUP" and the part of /var/log/messages that shows FreeeBSD
searching for the pool during the import.

It might be useful to know what disk controller is being used.

> =>        34  3907029101  ada3  GPT  (1.8T)
>           34        4062        - free -  (2.0M)
>         4096  3907025039     1  freebsd-zfs  (1.8T)

It is not related to your problem, but how did that unused space wind up
before partition 1?