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Date: Fri, 24 Jun 2016 20:06:06 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Vladislav Prodan <universite@ukr.net>
cc: perikillo <perikillo@gmail.com>,
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Subject: Re[2]: Re[2]: Re[2]: Copy bootcode to mirror disk?
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On Fri, 24 Jun 2016, Vladislav Prodan wrote:

>
>
> https://www.freebsd.org/doc/handbook/geom-mirror.html
>
> Make the mirror bootable by installing bootcode in the MBR and bsdlabel and setting the active slice:
>
> # gpart bootcode -b /boot/mbr mirror/gm0
> # gpart set -a active -i 1 mirror/gm0
> # gpart bootcode -b /boot/boot mirror/gm0s1

That is only valid for a GPT disk.  The problem is that the boot 
partition is mirrored.  The bootcode can probably be written to 
mirror/boot.

However, as I said on the forums to this very same thread, the real 
error here is having mirrored GPT partitions.