From owner-freebsd-fs@FreeBSD.ORG Fri May 22 21:35:14 2009 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 E1EE3106564A; Fri, 22 May 2009 21:35:14 +0000 (UTC) (envelope-from randy@psg.com) Received: from ran.psg.com (ran.psg.com [IPv6:2001:418:1::36]) by mx1.freebsd.org (Postfix) with ESMTP id C5E5E8FC13; Fri, 22 May 2009 21:35:14 +0000 (UTC) (envelope-from randy@psg.com) Received: from localhost ([127.0.0.1] helo=rmac.psg.com) by ran.psg.com with esmtp (Exim 4.69 (FreeBSD)) (envelope-from ) id 1M7cOY-000Csy-KW; Fri, 22 May 2009 21:35:14 +0000 Received: from rmac.local.psg.com (localhost [127.0.0.1]) by rmac.psg.com (Postfix) with ESMTP id 6C549190E8C6; Fri, 22 May 2009 14:35:14 -0700 (PDT) Date: Fri, 22 May 2009 14:35:14 -0700 Message-ID: From: Randy Bush To: Brooks Davis In-Reply-To: <20090522211513.GB2160@lor.one-eyed-alien.net> References: <20090522211513.GB2160@lor.one-eyed-alien.net> User-Agent: Wanderlust/2.15.5 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?ISO-8859-4?Q?Goj=F2?=) APEL/10.7 Emacs/22.3 (i386-apple-darwin9.6.0) MULE/5.0 (SAKAKI) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Cc: freebsd-fs Subject: Re: raidz2 a bit big 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: Fri, 22 May 2009 21:35:15 -0000 > raidz2 is RAID6ish in that two disks of a raid group go to parity to > allow you to survive double faults. Thus your expected size is: > > (12-2)*2TB = 20TB. thank you. randy