From owner-freebsd-fs@freebsd.org  Tue Nov 13 11:40:27 2018
Return-Path: <owner-freebsd-fs@freebsd.org>
Delivered-To: freebsd-fs@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8A76F1121A01
 for <freebsd-fs@mailman.ysv.freebsd.org>; Tue, 13 Nov 2018 11:40:27 +0000 (UTC)
 (envelope-from borjam@sarenet.es)
Received: from cu1176c.smtpx.saremail.com (cu1176c.smtpx.saremail.com
 [195.16.148.151])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 3374D8022F
 for <freebsd-fs@freebsd.org>; Tue, 13 Nov 2018 11:40:25 +0000 (UTC)
 (envelope-from borjam@sarenet.es)
Received: from [172.16.8.5] (unknown [192.148.167.11])
 by proxypop02.sare.net (Postfix) with ESMTPA id D52DA9DCF15;
 Tue, 13 Nov 2018 12:40:14 +0100 (CET)
Content-Type: text/plain;
	charset=utf-8
Mime-Version: 1.0 (Mac OS X Mail 12.1 \(3445.101.1\))
Subject: Re: ZFS flash systems
From: Borja Marcos <borjam@sarenet.es>
In-Reply-To: <CAHEMsqamBvTA=mTfkYxo-WdkF2_0D2RweAVAC+EMqOooTAziZw@mail.gmail.com>
Date: Tue, 13 Nov 2018 12:40:13 +0100
Cc: joe mcguckin <joe@via.net>,
 freebsd-fs@freebsd.org
Content-Transfer-Encoding: quoted-printable
Message-Id: <E7A19ECA-015A-43A2-907D-1A5923040C6E@sarenet.es>
References: <B6E30DCC-2E05-4849-A04B-E8F740DF1370@via.net>
 <CAHEMsqamBvTA=mTfkYxo-WdkF2_0D2RweAVAC+EMqOooTAziZw@mail.gmail.com>
To: Steven Hartland <killing@multiplay.co.uk>
X-Mailer: Apple Mail (2.3445.101.1)
X-Rspamd-Queue-Id: 3374D8022F
X-Spamd-Result: default: False [-2.54 / 200.00]; ARC_NA(0.00)[];
 RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-0.995,0];
 FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3];
 R_SPF_ALLOW(-0.20)[+ip4:195.16.148.0/24]; MV_CASE(0.50)[];
 MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[sarenet.es];
 NEURAL_HAM_LONG(-1.00)[-0.995,0]; TO_DN_SOME(0.00)[];
 TO_MATCH_ENVRCPT_SOME(0.00)[];
 MX_GOOD(-0.01)[smtp.sarenet.es,smtp.sarenet.es,smtp.sarenet.es];
 NEURAL_HAM_SHORT(-0.75)[-0.746,0];
 RCVD_IN_DNSWL_NONE(0.00)[151.148.16.195.list.dnswl.org : 127.0.10.0];
 IP_SCORE(0.00)[country: ES(0.02)]; FROM_EQ_ENVFROM(0.00)[];
 R_DKIM_NA(0.00)[]; RCVD_TLS_LAST(0.00)[];
 ASN(0.00)[asn:3262, ipnet:195.16.128.0/19, country:ES];
 MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]
X-Rspamd-Server: mx1.freebsd.org
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs/>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 13 Nov 2018 11:40:27 -0000



> On 11 Nov 2018, at 11:43, Steven Hartland <killing@multiplay.co.uk> =
wrote:
>=20
> It does perform well and it does have some specific knowledge when it =
comes
> to the underlying storage on FreeBSD specifically in knows rotating vs
> non-rotating media.

The worst issue is, unless I am wrong you won=E2=80=99t have hot swap. =
At least when I tried the code
for the =E2=80=9Cwarm swap=E2=80=9D ritual was not in place. You can=E2=80=
=99t just unplug like you would a SAS disk. You need
to put the device in quiescent mode before.

Also, beware the NVMes and their TRIM implementation. Check firmware =
versions and test in advance.
I had a nasty surprise with Intel NVMEs some time ago.





Borja.=