10.0-BETA4 (upgraded from 9.2-RELEASE) zpool upgrade -> boot failure

[Artem Belevich]

On Tue, Dec 10, 2013 at 2:22 AM, Florent Peterschmitt
<florent at peterschmitt.fr> wrote:
> Hi,
>
> Is there anything known about ZFS under 10.0-BETA4 when FreeBSD was
> upgraded from 9.2-RELEASE?
>
> I have two servers, with very different hardware (on is with soft raid
> and the other have not) and after a zpool upgrade, no way to get the
> server booting.

It may help if you could provide details on how exactly "no way to get
the system booting" manifests itself.
Serial console capture of a failed boot would be a good start.

Did it get to the loader?
Did the loader manage to read loader.conf and load kernel and modules?
Did the kernel start?
Did the kernel manage to mount root FS?

--Artem