From owner-freebsd-questions@FreeBSD.ORG Wed Feb 19 18:39:38 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 CFA25DA5; Wed, 19 Feb 2014 18:39:38 +0000 (UTC) Received: from mx1.fisglobal.com (mx1.fisglobal.com [199.200.24.190]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 8FB9C15FB; Wed, 19 Feb 2014 18:39:38 +0000 (UTC) Received: from smarthost.fisglobal.com ([10.132.206.193]) by ltcfislmsgpa05.fnfis.com (8.14.5/8.14.5) with ESMTP id s1JIauKn018009 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT); Wed, 19 Feb 2014 12:36:56 -0600 Received: from THEMADHATTER (10.242.181.54) by smarthost.fisglobal.com (10.132.206.193) with Microsoft SMTP Server id 14.3.174.1; Wed, 19 Feb 2014 12:36:53 -0600 From: Sender: Devin Teske To: References: <0fdd01cf2d29$dca0aba0$95e202e0$@FreeBSD.org> <4e4aa28301cedd61cb5693e79a90d0ab@dweimer.net> <0fdf01cf2d34$65d9de00$318d9a00$@FreeBSD.org> <87679f0a7789f01ad66b3c2ae55e3006@dweimer.net> <101101cf2d97$d708e630$851ab290$@FreeBSD.org> In-Reply-To: <101101cf2d97$d708e630$851ab290$@FreeBSD.org> Subject: RE: ZFS on Hardware RAID controller Date: Wed, 19 Feb 2014 10:36:50 -0800 Message-ID: <101701cf2da1$8f47ddb0$add79910$@FreeBSD.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQLZ7+7/ieFjnRxrw7xfyVSgmKX96wLfKSMrAmxEjEMCYeNcAwLaiwfuAoMsxjQB418jsAKoN686AfZonAACK13Mj5f5nTXA Content-Language: en-us X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.11.87, 1.0.14, 0.0.0000 definitions=2014-02-19_05:2014-02-18,2014-02-19,1970-01-01 signatures=0 X-Mailman-Approved-At: Wed, 19 Feb 2014 19:24:05 +0000 Cc: daver@vicor.com, questions@freebsd.org, 'Devin Teske' , freebsd@fongaboo.com, owner-freebsd-questions@freebsd.org, dteske@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: Wed, 19 Feb 2014 18:39:38 -0000 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. -- 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.