From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: RAID-6 Date: Wed, 16 Nov 2005 12:54:44 -0500 Message-ID: <437B7264.50506@tmr.com> References: <437701DE.7060400@wasp.net.au> <17271.4092.24066.572971@cse.unsw.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <17271.4092.24066.572971@cse.unsw.edu.au> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: RAID Linux List-Id: linux-raid.ids Based on some google searching on RAID-6, I find that it seems to be used to describe two different things. One is very similar to RAID-5, but with two redundancy blocks per stripe, one XOR and one CRC (or at any rate two methods are employed). The other sources define RAID-6 as RAID-5 with a distributed hot spare, AKA RAID-5E, which spreads head motion to all drives for performance. Any clarification on this? -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979