From owner-freebsd-fs Fri Jan 31 11:49: 3 2003 Delivered-To: freebsd-fs@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 35F2037B401; Fri, 31 Jan 2003 11:49:02 -0800 (PST) Received: from sccrmhc01.attbi.com (sccrmhc01.attbi.com [204.127.202.61]) by mx1.FreeBSD.org (Postfix) with ESMTP id EAA5C43F3F; Fri, 31 Jan 2003 11:49:00 -0800 (PST) (envelope-from julian@elischer.org) Received: from InterJet.elischer.org (12-232-168-4.client.attbi.com[12.232.168.4]) by sccrmhc01.attbi.com (sccrmhc01) with ESMTP id <200301311948590010087eaje>; Fri, 31 Jan 2003 19:49:00 +0000 Received: from localhost (localhost.elischer.org [127.0.0.1]) by InterJet.elischer.org (8.9.1a/8.9.1) with ESMTP id LAA46106; Fri, 31 Jan 2003 11:48:58 -0800 (PST) Date: Fri, 31 Jan 2003 11:48:56 -0800 (PST) From: Julian Elischer To: Steve Byan Cc: phk@freebsd.org, freebsd-fs@freebsd.org, tech-kern@netbsd.org Subject: Re: DEV_B_SIZE In-Reply-To: <1010FEB6-354F-11D7-B26B-00306548867E@maxtor.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org One thign I thought of is that it is not uncommon to 'dd' an entire filesystem from one partition to another. If we create a filesystem that is 'aligned' and we copy it to be 'unalligned', we'd have a sudden performance drop for no immediatly obvious reason. What was one write, would become a 2-sector read, modify and 2-sector write. Especially when copying from one failing drive to another with slightly different characteristics. The idea isn't bad but I think it should be sold as a 4k sector drive, with small print saying it can handle 512byte IO instead of the other way around. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message