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From: "Rao, Uthra R. (GSFC-672.0)[ADNET SYSTEMS INC]" <uthra.r.rao@nasa.gov>
To: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject: unable to boot to FreeBSD 10.1-RELEASE-p31 
Thread-Topic: unable to boot to FreeBSD 10.1-RELEASE-p31 
Thread-Index: AdGBLHM8vw8ZO/tYQ1C+0QDPSeW/5w==
Date: Fri, 18 Mar 2016 15:38:30 +0000
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I updated my FreeBSD 10 system to 10.1-RELEASE-p31 and rebooted. The system=
 is not booting. I see the following message on the screen:

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

Please let me know how I can fix this issue.

Thank You.