From owner-freebsd-stable@freebsd.org  Tue Feb 25 01:15:13 2020
Return-Path: <owner-freebsd-stable@freebsd.org>
Delivered-To: freebsd-stable@mailman.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.nyi.freebsd.org (Postfix) with ESMTP id 75B9524AD90
 for <freebsd-stable@mailman.nyi.freebsd.org>;
 Tue, 25 Feb 2020 01:15:13 +0000 (UTC) (envelope-from mike@karels.net)
Received: from mail.karels.net (mail.karels.net [216.160.39.52])
 by mx1.freebsd.org (Postfix) with ESMTP id 48RLZl1FbYz44pZ
 for <freebsd-stable@freebsd.org>; Tue, 25 Feb 2020 01:15:10 +0000 (UTC)
 (envelope-from mike@karels.net)
Received: from mail.karels.net (localhost [127.0.0.1])
 by mail.karels.net (8.15.2/8.15.2) with ESMTP id 01P1F9KX090465;
 Mon, 24 Feb 2020 19:15:10 -0600 (CST) (envelope-from mike@karels.net)
Message-Id: <202002250115.01P1F9KX090465@mail.karels.net>
To: Mario Olofo <mario.olofo@gmail.com>
cc: freebsd-stable@freebsd.org
From: Mike Karels <mike@karels.net>
Reply-to: mike@karels.net
Subject: Re: Running FreeBSD on M.2 SSD
In-reply-to: Your message of Mon, 24 Feb 2020 17:55:49 -0300.
 <CAP4Gn9DFAoQtq6NP4hZ-Jq=ddnhp7Bzc_X+Sce2FPVWn6kjASg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <90463.1582593309.1@mail.karels.net>
Date: Mon, 24 Feb 2020 19:15:09 -0600
X-Rspamd-Queue-Id: 48RLZl1FbYz44pZ
X-Spamd-Bar: ----
Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none;
 spf=pass (mx1.freebsd.org: domain of mike@karels.net designates 216.160.39.52
 as permitted sender) smtp.mailfrom=mike@karels.net
X-Spamd-Result: default: False [-4.46 / 15.00]; ARC_NA(0.00)[];
 HAS_REPLYTO(0.00)[mike@karels.net];
 NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[];
 TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:216.160.39.52:c];
 NEURAL_HAM_LONG(-1.00)[-1.000,0]; TAGGED_RCPT(0.00)[];
 MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[karels.net];
 REPLYTO_ADDR_EQ_FROM(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[];
 RCPT_COUNT_TWO(0.00)[2];
 IP_SCORE(-2.26)[ip: (-7.40), ipnet: 216.160.36.0/22(-3.78), asn: 209(-0.06),
 country: US(-0.05)]; FREEMAIL_TO(0.00)[gmail.com];
 RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[];
 R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+];
 ASN(0.00)[asn:209, ipnet:216.160.36.0/22, country:US];
 RCVD_COUNT_TWO(0.00)[2]
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-stable>, 
 <mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable/>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 25 Feb 2020 01:15:13 -0000

Mario, have you ruled out the possibility that the UFS and ZFS filesystems
are overlapping?  It would be worth a careful check of the partition table
and filesystem sizes.  You can check the actual UFS size with dumpfs.
I ask in part because UFS has a tendency to write to the last cylinder
group.

Also, are you sure you want to use both UFS and ZFS?  I do it personally
for historical reasons, but on a larger machine with several disks.  But
there are reasons not to use both, including different memory cache
strategies.

		Mike