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Date: Mon, 20 Sep 2010 16:46:33 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: John Hay <jhay@meraka.org.za>
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Cc: Boris Samorodov <bsam@ipt.ru>, freebsd-current@FreeBSD.org,
	Pawel Jakub Dawidek <pjd@FreeBSD.org>, krad <kraduk@gmail.com>,
	freebsd-arch@FreeBSD.org
Subject: Re: gptboot rewrite, bootonce, etc.
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on 20/09/2010 16:37 John Hay said the following:
> On Mon, Sep 20, 2010 at 03:59:20PM +0300, Andriy Gapon wrote:
>> on 20/09/2010 15:47 Pawel Jakub Dawidek said the following:
>>> No, it doesn't. ZFS works a bit differently. ZFS operate on pools, not
>>> really on partitions. One ZFS file system can span multiple
>>> disks/partitions. I'm not yet sure how to implement it, so it is
>>> intuitive, but I also haven't spend much time thinking about it. We
>>> needed UFS and that is what I implemented. It took me much more time
>>> than I expected anyway:)
>>
>> Maybe reserve some area inside zfs boot2 and put relevant information there.
>> Similarly to how boot0cfg modifies data within boot0.
>> The information could include "nextboot-pool" and "nextboot-fs".
> 
> nextboot-fs sounds nice. I use the bootfs property of zpool and it would
> be nice if one can override it from the boot2 commandline.

I have a patch for doing that from loader(8) prompt.
I.e. you can change a filesystem from which to load kernel+modules and you can
still set root filesystem of course.
http://people.freebsd.org/~avg/zfsboot.diff

This can be extended (i think rather easily) to override from where boot2 loads loader

-- 
Andriy Gapon