[Bug 221077] Boot from ZFS fails following freebsd-update

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221077

--- Comment #5 from Jason Bacon <bacon4000 at gmail.com> ---
Couldn't hold off on restoring this system, but I saved a copy of /boot and
dd'd a copy of the boot block just in case someone wants to examine it at some
point.

I have other root-on-zfs installations that are less critical, so if this
happens again, we can use them for diagnosis.

For my mission-critical systems, until this issue is understood and resolved,
I'm installing to UFS2 and leaving most of the disk free for a post-install ZFS
pool setup, e.g.

Filesystem             Size    Used   Avail Capacity  Mounted on
/dev/mfid0p2           242G    3.7G    219G     2%    /
devfs                  1.0K    1.0K      0B   100%    /dev
procfs                 4.0K    4.0K      0B   100%    /proc
fdescfs                1.0K    1.0K      0B   100%    /dev/fd
zroot/share1           5.0T    726G    4.3T    14%    /share1
zroot/sharedapps       4.3T    5.3G    4.3T     0%    /sharedapps
zroot/tmp              4.3T     68K    4.3T     0%    /tmp
zroot/home             4.3T    7.1G    4.3T     0%    /usr/home
zroot/var              4.3T    502M    4.3T     0%    /var
zroot/var/cache        4.3T     25K    4.3T     0%    /var/cache
zroot/var/cache/pkg    4.3T    211M    4.3T     0%    /var/cache/pkg

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