From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from csamuel.org ([74.50.50.137]:45213 "EHLO csamuel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751208AbbAAB0W (ORCPT ); Wed, 31 Dec 2014 20:26:22 -0500 Received: from localhost (localhost [127.0.0.1]) by csamuel.org (Postfix) with ESMTP id 7AA17406B8 for ; Thu, 1 Jan 2015 12:26:21 +1100 (AEDT) Received: from csamuel.org ([127.0.0.1]) by localhost (csamuel.org [127.0.0.1]) (amavisd-maia, port 10024) with LMTP id 15620-04 for ; Thu, 1 Jan 2015 12:26:21 +1100 (AEDT) Received: from quad.localnet (2001-44b8-41dd-d500-4435-4821-17f6-29f5.static.ipv6.internode.on.net [IPv6:2001:44b8:41dd:d500:4435:4821:17f6:29f5]) by csamuel.org (Postfix) with ESMTPSA id 15FC64036F for ; Thu, 1 Jan 2015 12:26:21 +1100 (AEDT) From: Chris Samuel To: linux-btrfs@vger.kernel.org Subject: Re: I need to P. are we almost there yet? Date: Thu, 01 Jan 2015 12:26:25 +1100 Message-ID: <2740386.L6W23cCsJO@quad> In-Reply-To: <1da0cf9a75a357c960af323aa56c7530.squirrel@webmail.wanet.net> References: <54A3633C.3040609@ubuntu.com> <1da0cf9a75a357c960af323aa56c7530.squirrel@webmail.wanet.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Wed, 31 Dec 2014 09:27:14 AM ashford@whisperpc.com wrote: > I see this as a CRITICAL design flaw. The reason for calling it CRITICAL > is that System Administrators have been trained for >20 years that RAID-10 > can usually handle a dual-disk failure, but the BTRFS implementation has > effectively ZERO chance of doing so. I suspect this is a knock-on effect of the fact that (unless this has changed recently & IIRC) RAID-1 with btrfs will only mirrors data over two drives, no matter how many you add to an array. -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC