Received: with ECARTIS (v1.0.0; list xfs); Fri, 15 Sep 2006 16:50:39 -0700 (PDT) Received: from ty.sabi.co.UK (82-69-39-138.dsl.in-addr.zen.co.uk [82.69.39.138]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id k8FNoTZd026063 for ; Fri, 15 Sep 2006 16:50:32 -0700 Received: from from [127.0.0.1] (helo=base.ty.sabi.co.UK) by ty.sabi.co.UK with esmtp(Exim 4.62 #1) id 1GONR8-0002lz-Ue for ; Sat, 16 Sep 2006 00:49:34 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <17675.15374.698393.232722@base.ty.sabi.co.UK> Date: Sat, 16 Sep 2006 00:49:34 +0100 X-Face: SMJE]JPYVBO-9UR%/8d'mG.F!@.,l@c[f'[%S8'BZIcbQc3/">GrXDwb#;fTRGNmHr^JFb SAptvwWc,0+z+~p~"Gdr4H$(|N(yF(wwCM2bW0~U?HPEE^fkPGx^u[*[yV.gyB!hDOli}EF[\cW*S H&spRGFL}{`bj1TaD^l/"[ msn( /TH#THs{Hpj>)]f> Subject: Re: swidth with mdadm and RAID6 In-Reply-To: References: X-Mailer: VM 7.17 under 21.4 (patch 19) XEmacs Lucid From: pg_xfs@xfs.for.sabi.co.UK (Peter Grandi) X-Disclaimer: This message contains only personal opinions X-archive-position: 8992 X-ecartis-version: Ecartis v1.0.0 Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com X-original-sender: pg_xfs@xfs.for.sabi.co.UK Precedence: bulk X-list: xfs Content-Length: 574 Lines: 13 >>> On Fri, 15 Sep 2006 17:07:07 -0400 (EDT), Steve Cousins >>> said: cousins> I have a RAID6 array of 11 500 GB drives using mdadm. cousins> There is one hot-spare so the number of data drives is cousins> 8. I used mkfs.xfs with defaults to create the file cousins> system and it seemed to pick up the chunk size I used cousins> correctly (64K) but I think it got the swidth wrong. Worrying about the impact on performance of a relatively small thing like 'swidth' for something like an 8+2 RAID6 is quite funny. http://WWW.BAARF.com/