ZFS: can't read MOS of pool

[Volodymyr Kostyrko]

22.07.2013 19:18, Łukasz Wąsikowski wrote:
> I've got a problem with booting zfs-on-root FreeBSD 9.2-PRERELEASE. I'm
> getting:
>
> ZFS: i/o error - all block copies unavailable
> ZFS: can't read MOS of pool klawisz
> gptzfsboot: failed to mount default pool klawisz
>
> Machine is VM running under KVM on Proxmox 2.3-13. VM has 8 GB of RAM,
> 400 GB of local storage with SCSI Controller type: Default (lsi).
>
> I'm not sure what I did to make this VM unbootable. I've installed
> 9.2-PRERELEASE, did source based upgrade to r253470, mergemaster,
> reinstalled bootcode and rebooted. To this point VM was bootable.
>
> Then I did installworld from /usr/src to ezjail's basejail (ezjail-admin
> update -i), did mergemaster for jails, install some ports - none of this
> should mess with booting. I rebooted VM and got unbootable system.
>
> When I boot from liveCD I can import this pool (scrub shows no errors),
> mount it, chroot to it, and work with it. I just can't get it to boot.
>
> Some information about the system:
> http://pastie.org/private/mtfhkx0wx0vve29xn0plw
>
> I've tried to downgrade to r252316 - no luck, system is still unbootable.
>
> Any hints how to go from here?

First, how did you update bootcode? `ls -la /boot` also wood help.

Second, what is your /etc/make.conf and /etc/src.conf?

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