From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:58949 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754085Ab3KTQoS (ORCPT ); Wed, 20 Nov 2013 11:44:18 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1VjAsz-0003ZT-FU for linux-btrfs@vger.kernel.org; Wed, 20 Nov 2013 17:44:17 +0100 Received: from ip68-231-22-224.ph.ph.cox.net ([68.231.22.224]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 20 Nov 2013 17:44:17 +0100 Received: from 1i5t5.duncan by ip68-231-22-224.ph.ph.cox.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 20 Nov 2013 17:44:17 +0100 To: linux-btrfs@vger.kernel.org From: Duncan <1i5t5.duncan@cox.net> Subject: Re: Actual effect of mkfs.btrfs -m raid10 ... -d raid10 ... Date: Wed, 20 Nov 2013 16:43:57 +0000 (UTC) Message-ID: References: <20131119090602.GV4315@carfax.org.uk> <20131120080958.GA28883@carfax.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hugo Mills posted on Wed, 20 Nov 2013 08:09:58 +0000 as excerpted: > RAID-0: min 2 devices > RAID-10: min 4 devices > RAID-5: min 2 devices (I think) > RAID-6: min 3 devices (I think) RAID-5 should be 3-device minimum (each stripe consisting of two data segments and one parity segment, each on a different device). And RAID-6 similarly four devices (two data and two parity). Perhaps it's time I get that wiki account and edit some of this stuff myself... -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman