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Date: Tue, 31 Jul 2012 17:37:21 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Richard Yao <ryao@gentoo.org>
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Cc: stable@FreeBSD.org
Subject: Re: FreeBSD 9.1-BETA1 amd64 fails to mount ZFS rootfs with error
 2 when system has more than 3584MB of RAM
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on 31/07/2012 06:22 Richard Yao said the following:
> Dear Everyone,
> 
> I am running FreeBSD 9.1-BETA1 amd64 on ZFS in KVM on Gentoo Linux on
> ZFS. The root pool uses ashift=13 and is on a single disk. The kernel
> fails to mount the root filesystem if the system has more than 3584MB of
> RAM. I did a manual binary search to try to find the exact upper limit,
> but stopped when I tried 3648MB.
> 
> FreeBSD 9.0-RELEASE works perfectly.


Are you able to catch dmesg up to mount failure?
If yes, then please set vfs.zfs.debug=1 in loader.conf or at the prompt and share
the messages.

-- 
Andriy Gapon