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Date:      Mon, 28 Jan 2019 21:58:25 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 221077] Boot from ZFS fails following freebsd-update
Message-ID:  <bug-221077-3630-nfkhsd157A@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-221077-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-221077-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221077

--- Comment #14 from Jason W. Bacon <jwb@freebsd.org> ---
I suspect that ZFS may have a conflict with certain RAID controllers, perha=
ps
both trying to use the same lower blocks for volume management?  I don't kn=
ow
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 managem=
ent
has never given me a problem.  I've been using it regularly as long as it h=
as
been available in FreeBSD.

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

--=20
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