From owner-freebsd-questions@FreeBSD.ORG Fri May 30 16:46:04 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id B6848D4F for ; Fri, 30 May 2014 16:46:04 +0000 (UTC) Received: from smtp.infracaninophile.co.uk (smtp6.infracaninophile.co.uk [IPv6:2001:8b0:151:1:3cd3:cd67:fafa:3d78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "smtp.infracaninophile.co.uk", Issuer "ca.infracaninophile.co.uk" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 5AF372932 for ; Fri, 30 May 2014 16:46:04 +0000 (UTC) Received: from ox-dell39.ox.adestra.com (no-reverse-dns.metronet-uk.com [85.199.232.226] (may be forged)) (authenticated bits=0) by smtp.infracaninophile.co.uk (8.14.8/8.14.8) with ESMTP id s4UGjvuv061361 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO) for ; Fri, 30 May 2014 17:45:58 +0100 (BST) (envelope-from m.seaman@infracaninophile.co.uk) Authentication-Results: lucid-nonsense.infracaninophile.co.uk; dmarc=none header.from=infracaninophile.co.uk DKIM-Filter: OpenDKIM Filter v2.8.3 smtp.infracaninophile.co.uk s4UGjvuv061361 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=infracaninophile.co.uk; s=201001-infracaninophile; t=1401468358; bh=a756zC5StQBtGJr7W0gtubmyBKP/9fa5WB1G7EvpbXo=; h=Date:From:To:Subject:References:In-Reply-To; z=Date:=20Fri,=2030=20May=202014=2017:45:50=20+0100|From:=20Matthew =20Seaman=20|To:=20freebsd-questi ons@freebsd.org|Subject:=20Re:=20ZFS=20Recommendations=20for=20a=2 0new=20server|References:=20|In-Reply-To:=20; b=I/GLHQyW/dC35Qpevq1HK0fBo0x7LgGN8B2ySe4otlybLlUGc/bQvEQX8p9gdfubV bodl99Elujbz8EJSX8gL/n8TEjHU+wgzFkVBU2U1sYrhkhNx1K4wzFVj4tJWu4bTTj zCP7fssZsUxGitmIfBlm+5QVZa3MmT7OsZp3Lhjc= X-Authentication-Warning: lucid-nonsense.infracaninophile.co.uk: Host no-reverse-dns.metronet-uk.com [85.199.232.226] (may be forged) claimed to be ox-dell39.ox.adestra.com Message-ID: <5388B5BE.6050609@infracaninophile.co.uk> Date: Fri, 30 May 2014 17:45:50 +0100 From: Matthew Seaman User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 MIME-Version: 1.0 To: freebsd-questions@freebsd.org Subject: Re: ZFS Recommendations for a new server References: In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="8JgAd04FCwJ3toLCshphPVRHpgvnwnWox" X-Virus-Scanned: clamav-milter 0.98.3 at lucid-nonsense.infracaninophile.co.uk X-Virus-Status: Clean X-Spam-Status: No, score=-1.7 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,RDNS_NONE,SPF_FAIL autolearn=no autolearn_force=no version=3.4.0 X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lucid-nonsense.infracaninophile.co.uk X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 May 2014 16:46:04 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --8JgAd04FCwJ3toLCshphPVRHpgvnwnWox Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 05/30/14 16:11, Alejandro Imass wrote: > The new server has a 2 x 1TB RE4 3ware 9650SE RAID and I have friends t= hat > tell me is actually better to use ZFS RAID instead of HW RAID1. Is this= > true? Why so? I recently had a similar setup using an old 3ware RAID card, which we upgraded to 4TB drives .... and then had to ditch the 3ware card and replace it with a LSI HBA because the 3ware card didn't recognise anything beyond the first 2TB or the drives. Yes, you want to use ZFS RAID rather than putting ZFS onto a single virtual drive presented by your RAID controller. ZFS does all the resilience and patrol read^W^Wzpool scrubbing and disk IO caching and stuff using your system's main RAM and CPUs which are generally a lot more capable than any RAID controller. Plus ZFS does it better -- 'punctured stripe' is not something that happens to ZFS for instance. Even though 3ware does have a 'pass through' mode -- which is what you'ld want with ZFS, the RAID controller still gets in the way to some extent. Just using a plain and simple HBA gives much better performance.= Cheers, Matthew --8JgAd04FCwJ3toLCshphPVRHpgvnwnWox Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQJ8BAEBCgBmBQJTiLXFXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQxOUYxNTRFQ0JGMTEyRTUwNTQ0RTNGMzAw MDUxM0YxMEUwQTlFNEU3AAoJEABRPxDgqeTn3m0P+wWB/xiVjZATmbSMmW/Jo7a4 6zpBoRghmrM6jg41fGTawFTRe9jo/K3FCDFodjg+Lh3HG18sR/MtXJP6hg6ytt97 yH2gBZniF+TsPS9h3cH6cUffJA8zyR+erp0a4sAJO5GS/lzBhqHf6/FC219noBEn KtHdF+OOt4ky4nHcYlpuwE6bkyDBNJk4qgUDz1Gg3I0Ic8oOw0CLL33XG7Qb8Sqj Ugvv5EA/U2HX1T462GcMknXqyJP2Tg4NBe5HpyDpdnucBL44mvKwXjuwhMClN5lO dLxGHlQY497QBqC3gpDqV62nm6naS3G2yJz1GcvCdPWFR/BAsuk4TH/JezfN4r8l h53bGaH4YLJNy0ynGoqIG16mwP2JOKFuBtyghdACo6kE/Flm5KzPk1bmCXRF++ra L95Rz7/P/IW9tBUjYd7RbLX4CogUPTmZKoGnB76SXds4Atex6ys2pfGQnTy7ECV5 pWg61xHDZ9BHUb+enaEzVhCD5NmIpNQq8sCC4iuLtZ+n/PluOqQ5+S9B+gHOwOsJ d9dM6AOjYKwZFv0mqCGPsO5x0uRjhS74HSqzIL802mfJZVB09FpVHKVDI786U524 qTNBWNlYzm+Y7/O1KkQ6GHKRB2m62B/5/0/S3ByiE+j7IPus1/1zsUzdHnNEQ3sm fkL/7ACG2wK1oIfDFbno =OEQ3 -----END PGP SIGNATURE----- --8JgAd04FCwJ3toLCshphPVRHpgvnwnWox--