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Date: Thu, 14 May 2009 16:25:02 +0100
From: Doug Rabson <dfr@rabson.org>
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Cc: freebsd-fs@freebsd.org
Subject: Re: Booting from ZFS raidz
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On Sun, 1 Feb 2009 18:24:32 +1100, Peter Jeremy
<peterjeremy@optushome.com.au> wrote:
> On 2008-Dec-17 18:25:51 +0000, Doug Rabson <dfr@rabson.org> wrote:
>>I've been working on adding raidz and raidz2 support to the boot code  
>>and I have a patch which could use some testing if anyone here is  
>>interested. This http://people.freebsd.org/~dfr/ 
>>raidzboot-17122008.diff adds support for raidz and raidz2. The easiest  
>>way to prepare a bootable pool is to put a GPT boot partition on each  
>>disk that will make up the raidz pool and install gptzfsboot on the  
>>boot partition of every drive.
> 
> This sounds great so I thought I'd try it.  Unfortunately, it didn't
> work on my degraded pool [ZFS managed to kill a disk and I thought I'd
> experiment].  When I tried to boot, I got:
> ZFS: i/o error - all block copies unavailable
> ZFS: can't read MOS
> ZFS: unexpected object set type lld
> 
> FreeBSD/i386 boot
> Default: tank:/boot/loader
> boot:
> 
> The boot loader is up-to-date and was built with 'LOADER_ZFS_SUPPORT'.
> Any ideas?

I fixed a bug in the patch. Try this version:
http://people.freebsd.org/~dfr/raidzboot-14052009.diff