[Bug 183328] freebsd-update upgrade from 9.1 to 9.2 for zfs on root results in unbootable system

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=183328

Garrett Cooper,425-314-3911 <ngie at FreeBSD.org> changed:

           What    |Removed                     |Added
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           Assignee|freebsd-bugs at FreeBSD.org    |freebsd-fs at FreeBSD.org
                 CC|                            |ngie at FreeBSD.org

--- Comment #1 from Garrett Cooper,425-314-3911 <ngie at FreeBSD.org> ---
(In reply to dms from comment #0)

Unfortunately the forum page is a 404 now :(.

I'm guessing you ran into a slew of errors like "boot: ZFS: i/o error - all
block copies unavailable". I recently replaced a spinning rust disk with an SSD
(with 4kB sectors), installed 9.3, upgraded to the latest point release, and
unfortunately ran into this unbootable scenario, similar to what you've
described below.

I had to wipe out my root zpool and repartition the SSD. Fortunately I didn't
have any critical data on it, but it was unfortunate that I had to hop through
that hoop in order to get my system back in working shape..

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