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From: Berczi Gabor <freebsd@berczi.be>
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Cc: Volodymyr Kostyrko <c.kworr@gmail.com>
Subject: Re: ZFS boot fails with two pools
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On Jul 6, 2011, at 10:08 PM, Volodymyr Kostyrko wrote:

> 1. Check that pools have up-to-date boot code.

I tried 8.2 and HEAD. You mean gpart+gptzfsboot+pmbr, right?

> 2. Try to convince bios to boot from the disk of pool2.

There is no disk with a singular ZFS pool.

> 3. You can possibly try deploying /boot/boot0 MBR selector code over =
disks of data pool. Supplied boot0 code can be used to choose another =
disk to jump to it during boot process and will remember the last =
choice.

I'm not really sure how to do this with GPT. Should I use boot0 instead =
of pmbr?

However, this =
(http://freebsd.1045724.n5.nabble.com/Booting-from-ZFS-raidz-td4032461.htm=
l) may be related to the problem:

> You can boot from any of the drives and as long as the BIOS can see  =20=

> enough drives you should be able to boot.

In my case, the BIOS certainly can not see all members of the raid-z =
pool. The question is: why does it want to boot from raid-z at all, and =
how could it be persuaded to use the mirrored pool instead?