[Bug 222425] GPT broken after "gpart backup ada0 | gpart restore -F ada1"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222425

--- Comment #6 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to chris from comment #4)
> I run:
> 
> gpart backup ada0 | gpart restore -F ada1
> true > /dev/ada1
> gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada1

So, if partition table is still here after `true > /dev/ada1`, this means that
before reboot you have correct partition table.

And this means that gptboot by some cause thinks that GPT at the boot moment is
wrong.
I assume, that when you return back the booting from ada0 in the BIOS,
partition tables on both disk are good? I.e. `gpart show` shows all partitions
without CORRUPT word.
Can you try to write gptboot from 10.3?
I.e. `gpart bootcode -b /boot/pmbr -p /10.3/boot/gptboot -i 1 ada1` 
where /10.3/boot/gptboot - is bootcode from 10.3.

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