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

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

--- Comment #14 from Jason W. Bacon <jwb at freebsd.org> ---
I suspect that ZFS may have a conflict with certain RAID controllers, perhaps
both trying to use the same lower blocks for volume management?  I don't know
much about ZFS internals so this is just a barely-educated guess, but every
case I've seen of this problem with full details available (all of mine and a
few others) have involved ZFS on a hardware RAID.

ZFS on a hardware RAID seems to work fine as long as you don't try to boot from
it.  Booting from ZFS on a single disk or allowing ZFS to do volume management
has never given me a problem.  I've been using it regularly as long as it has
been available in FreeBSD.

If you look around you'll see other comments about why ZFS should not be used
on a hardware RAID.  I haven't yet found one specifically about this issue, but
they're worth reading.

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