From owner-freebsd-questions@FreeBSD.ORG Sat Feb 22 20:25:43 2014 Return-Path: Delivered-To: questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 61A6E766 for ; Sat, 22 Feb 2014 20:25:43 +0000 (UTC) Received: from mail-yk0-x22e.google.com (mail-yk0-x22e.google.com [IPv6:2607:f8b0:4002:c07::22e]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 1BF4019AC for ; Sat, 22 Feb 2014 20:25:43 +0000 (UTC) Received: by mail-yk0-f174.google.com with SMTP id 20so9968594yks.5 for ; Sat, 22 Feb 2014 12:25:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=content-type:mime-version:subject:from:in-reply-to:date:cc :message-id:references:to; bh=e14b5CuurtdlI6TiIjtQzZ4aNnLTHnwhNs/DbO/YQ+4=; b=Qit9blDVhauOBHDbEHUuKPOiCQT1LVBjH9fU9NeBI+oKSW7YP33l3JuaaGNGTzC02y af0qXhWoIIyH2cAxrVgnWcrIDa6fbl8fDGGqZNVJ4xqEmqOJqibxve6mZN4gkZhmhmGu /Jx5oJG8DOxLmrdS5VRfY0lkSh4fsxh9WCA5BdcXdWyp7dRs+W8E1tq1UR6cn89XQ4JK MYojav28E3c4y/BF4+7VEtCGHKEVv9si+bbW/oQ+Psl3ly+/RVc/F5cED6ex1N3u223A HL2HIAlOeBH6/Wi4DMhHDnEuQQbys0I/oQdvWA1sULNoybbWttGHeRMXZrVFm3cRUR6F c5GA== X-Received: by 10.236.143.148 with SMTP id l20mr19845765yhj.102.1393100742258; Sat, 22 Feb 2014 12:25:42 -0800 (PST) Received: from [192.168.1.76] (75-63-29-182.lightspeed.irvnca.sbcglobal.net. [75.63.29.182]) by mx.google.com with ESMTPSA id 57sm32308973yhl.4.2014.02.22.12.25.41 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 22 Feb 2014 12:25:41 -0800 (PST) Mime-Version: 1.0 (Mac OS X Mail 7.1 \(1827\)) Subject: Re: ZFS on Hardware RAID controller From: aurfalien In-Reply-To: Date: Sat, 22 Feb 2014 12:25:38 -0800 Message-Id: <42536FB2-1641-401A-8196-3428C3B5F17C@gmail.com> References: To: freebsd@fongaboo.com X-Mailer: Apple Mail (2.1827) Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.17 Cc: questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Feb 2014 20:25:43 -0000 Perfect=85=20 =85 letting ZFS do the raid-ing if you will, for you. - aurf "Janitorial Services" On Feb 22, 2014, at 12:22 PM, freebsd@fongaboo.com wrote: >=20 > So I think it's fair to say that there is some ambiguous information = out there about the definition of JBOD. >=20 > So, without worrying about settling the discrepency over nomenclature, = is it correct to say that... >=20 > If I am planning to use ZFS on a machine where the drive controller = happens to be one that can be configured for some combination of = HARDWARE RAID... >=20 > I should configure it so that it does not concatenate/span/combine the = drives in any way at the hardware level. >=20 > I need to configure it as if it wasn't even a RAID controller, but = rather in a configuration where the motherboard/filesystem/OS will = initially see each physical drive as its own volume. >=20 > TRUTH? >=20 >=20 > Thanx >=20 >=20 > FONG >=20 >=20 > On Wed, 19 Feb 2014, dteske@FreeBSD.org wrote: >=20 >> Re: JBOD... >> I think it's very telling that when Google gives you >> the description of JBOD, it actually comes from the >> Wikipedia, but ... it doesn't include the [misleading] >> statement about the [optional] act of joining the >> disks. >> Google's Definition: >> Just a Bunch Of Disks. A collection of hard disks that >> aren't configured according to RAID; A hard disk >> enclosure for several disks, especially one lacking a >> RAID controller >> Source: http://en.wiktionary.org/wiki/JBOD >> Definition from >> JBOD (abbreviated from "just a bunch of disks") is an >> architecture using multiple hard drives, but not in a >> RAID configuration, thus providing neither redundancy >> nor performance improvements. Hard drives *may be* >> handled independently as separate logical volumes, or >> they *may be* combined into a single logical volume >> using a volume manager like LVM; such [optionally >> combined] volumes are usually called "spanned".[2] >> I added the *'s around "may be" and also added the >> "[optionally combined]" texts to help clarify that for >> you. And I would go on to further say that the LVM >> volume manager used to combine the JBOD-access >> devices is not part of nor has any relation to said >> JBOD access. JBOD is a means of exporting the disks >> to the volume manager whose use is optional. >> --=20 >> Devin >> _____________ >> The information contained in this message is proprietary and/or = confidential. If you are not the intended recipient, please: (i) delete = the message and all copies; (ii) do not disclose, distribute or use the = message in any manner; and (iii) notify the sender immediately. In = addition, please be aware that any message addressed to our domain is = subject to archiving and review by persons other than the intended = recipient. Thank you. >>=20 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to = "freebsd-questions-unsubscribe@freebsd.org"