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Date: Thu, 17 Nov 2016 12:19:26 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Baho Utot <baho-utot@columbus.rr.com>
cc: Mailinglists FreeBSD <freebsd-questions@freebsd.org>
Subject: Re: Ok How do I boot this monster?
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On Thu, 17 Nov 2016, Baho Utot wrote:

> Ok I have installed 11.0 latest memstick image.
>
> I patched/hacked bsdinstall ( /usr/libexec/bsdinstall/zfsboot) to install my 
> zfs raidz2 using 800GB partitions.  And it even worked!
>
> Now I need to boot this monster as well as my current 10.0 version until I 
> can build my desktop upon the raidz, then I will decommission the 10.0 
> version when the 11.0 version is up to snuff.
>
> I have boot0 install to ada0 which boots win7 and 10.0 freebsd.
>
> Can this also boot the raidz?

No, boot0 is MBR-only.  The easiest way I see to do this is to install 
gptzfsboot bootcode to the ZFS drives and choose one of them from the 
BIOS boot menu.  Grub can multi-boot GPT also, although it needs a small 
partition of its own.