From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id n1BLD8dR155324 for ; Wed, 11 Feb 2009 15:13:09 -0600 Received: from mailsrv1.zmi.at (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 85A8B10DF6B for ; Wed, 11 Feb 2009 13:12:30 -0800 (PST) Received: from mailsrv1.zmi.at (mailsrv1.zmi.at [212.69.162.198]) by cuda.sgi.com with ESMTP id mMngAvGyJfQPTQST for ; Wed, 11 Feb 2009 13:12:30 -0800 (PST) Received: from mailsrv2.i.zmi.at (h081217054243.dyn.cm.kabsi.at [81.217.54.243]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client CN "mailsrv2.i.zmi.at", Issuer "power4u.zmi.at" (not verified)) by mailsrv1.zmi.at (Postfix) with ESMTP id 7964E3F7A for ; Wed, 11 Feb 2009 22:12:28 +0100 (CET) Received: from saturn.localnet (saturn.i.zmi.at [10.0.0.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mailsrv2.i.zmi.at (Postfix) with ESMTPSA id DAE7B400160 for ; Wed, 11 Feb 2009 22:12:28 +0100 (CET) From: Michael Monnerie Subject: Re: sunit & swidth on RAID-1? Date: Wed, 11 Feb 2009 22:12:28 +0100 References: <20090211155638.GA3864@dentifrice> <20090211165316.GA4430@dentifrice> In-Reply-To: <20090211165316.GA4430@dentifrice> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200902112212.28571@zmi.at> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com On Mittwoch 11 Februar 2009 mike dentifrice wrote: > =A0 =A0 =A0 =A0 sunit=3D0 =A0 =A0 =A0swidth=3D0 blks, unwritten=3D1 > =A0 =A0 =A0 =A0 sectsz=3D512 =A0 sunit=3D0 blks > > What's the consequence of 0 values in this case? XFS then knows that 512 byte (aka sector) alignment is sufficient, as = RAID-1 will only write 512b to each disk and does not need full stripe = unit writes like RAID-4/5/6 need. Therefore performance is better with = the values you have. mfg zmi -- = // Michael Monnerie, Ing.BSc ----- http://it-management.at // Tel: 0660 / 415 65 31 .network.your.ideas. // PGP Key: "curl -s http://zmi.at/zmi.asc | gpg --import" // Fingerprint: AC19 F9D5 36ED CD8A EF38 500E CE14 91F7 1C12 09B4 // Keyserver: wwwkeys.eu.pgp.net Key-ID: 1C1209B4 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs