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Date: Thu, 02 Dec 2010 00:22:37 -0600
From: "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org>
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To: "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>
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Cc: bu7cher@yandex.ru, freebsd-questions@FreeBSD.ORG
Subject: Re: CURRENT: Issue with ZFS and 2TB WD HDD (WDC
	WD20EURS-63Z9B1	80.00A80)
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On 12/1/2010 5:36 PM, O. Hartmann wrote:
> There is no valuable dmesg/message output, due to the simple fact,
> that after yesterday's "make world" and another import try the
> BACKUP00 pool was imported. The only thing to report is, that while
> importing the BACKUP00 pool, which is on devise ada3, I got an message
> on console like:
>
> Nov 29 21:13:36 <0.2> thor kernel: ZFS WARNING: Unable to attach to ada1.

Unfortunately until the problem reproduces there's no way to dig into it
further.  boot-verbose will show what ZFS finds when it scans ada3p1
both for the pool and for the vdev (by GUID).

ZFS can't claim ada1 since that's GPT-partitioned.