From owner-freebsd-fs@FreeBSD.ORG Wed Jul 11 00:16:06 2012 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 807E8106566C for ; Wed, 11 Jul 2012 00:16:06 +0000 (UTC) (envelope-from bfriesen@simple.dallas.tx.us) Received: from blade.simplesystems.org (blade.simplesystems.org [65.66.246.74]) by mx1.freebsd.org (Postfix) with ESMTP id 3DEA78FC12 for ; Wed, 11 Jul 2012 00:16:05 +0000 (UTC) Received: from freddy.simplesystems.org (freddy.simplesystems.org [65.66.246.65]) by blade.simplesystems.org (8.14.4+Sun/8.14.4) with ESMTP id q6B08dFe027114; Tue, 10 Jul 2012 19:08:39 -0500 (CDT) Date: Tue, 10 Jul 2012 19:08:39 -0500 (CDT) From: Bob Friesenhahn X-X-Sender: bfriesen@freddy.simplesystems.org To: Jason Usher In-Reply-To: <1341863894.36655.YahooMailClassic@web122501.mail.ne1.yahoo.com> Message-ID: References: <1341863894.36655.YahooMailClassic@web122501.mail.ne1.yahoo.com> User-Agent: Alpine 2.01 (GSO 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.2 (blade.simplesystems.org [65.66.246.90]); Tue, 10 Jul 2012 19:08:39 -0500 (CDT) Cc: freebsd-fs@freebsd.org Subject: Re: vdev/pool math with combined raidzX vdevs... X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Jul 2012 00:16:06 -0000 On Mon, 9 Jul 2012, Jason Usher wrote: > > Am I really the only person worrying about the interactive failure properties of combining vdevs into a pool ? Yes. You are the only one. The strength of the individual vdev is the primary determining factor of the strength of the pool. However, one must not discount the "forklift" factor and the "fat finger" factor which quickly become more significant factors to the health of your pool. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/