ZFS: i/o error - all block copies unavailable

Dan Langille dan at langille.org
Mon Feb 22 17:41:15 UTC 2016

I have a FreeBSD 10.2 (with freebsd-update applied) system at home which cannot boot. The message is:

ZFS: i/o error - all block copies unavailable
ZFS: can't read MOS of pool system
gptzfsboot: failed to mount default pool system

The screen shot is https://twitter.com/DLangille/status/701611716614946816

The zpool name is 'system'.

I booted the box via mfsBSD thumb drive, and was able to import the zpool: https://gist.github.com/dlangille/6da065e309301196b9cd <https://gist.github.com/dlangille/6da065e309301196b9cd>

I have also run: "gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 XXX" against each drive. I did with the the files
provided with mfsBSD and with the files from my local 10.2 system.  Neither solution changed the booting problem.

Ideas?  Suggestions?

Dan Langille - BSDCan / PGCon
dan at langille.org

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