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Date: Thu, 06 Oct 2011 13:44:50 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Henri Hennebert <hlh@restart.be>
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Cc: freebsd-fs@FreeBSD.org, current@FreeBSD.org
Subject: Re: zfsloader 9.0 BETA3 r225759 - i/o error - all block copies
	unavailable
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on 06/10/2011 12:25 Henri Hennebert said the following:
> Hello all,
> 
> I upgrade from 9.0-BETA2 to 9.0-BETA3 (r225759) and when booting from a zpool I get:
> 
> ZFS: i/o error - all block copies unavailable
> can't open '/boot/menu.rc': no such file or directory.
> 
> I pxe boot mfsbsd 8.2-RELEASE + zfs v28
> 
> then:
> 
> mkdir /rpool
> zpool import -R /rpool rpool
> mount -t zfs rpool/boot /mnt
> mv /mnt/boot/menu.rc /mnt/boot/Menu.rc
> cp /mnt/boot/Menu.rc /mnt/boot/menu.rc
> umount /mnt
> 
> shutdown -r now
> 
> and the next boot run smoothly...

Does your root fs have compression enabled?

> PS.
> I have to boot from pxe because after the i/o error, the kernel was booted but
> encounter a double fault. I try 5 times with the same result.
> 
> I think that on my configuration only the kernel without ACPI encouter this trap.

I think that you should try to gather and report more information about the panic
(separately).

-- 
Andriy Gapon