From owner-freebsd-fs Fri Jan 31 11:11:18 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 18EFF37B401 for ; Fri, 31 Jan 2003 11:11:17 -0800 (PST) Received: from mcomail02.maxtor.com (mcomail02.maxtor.com [134.6.76.16]) by mx1.FreeBSD.org (Postfix) with ESMTP id 590AE43F43 for ; Fri, 31 Jan 2003 11:11:16 -0800 (PST) (envelope-from stephen_byan@maxtor.com) Received: from mcoexc03.mlm.maxtor.com (localhost.localdomain [127.0.0.1]) by mcomail02.maxtor.com (8.11.6/8.11.6) with ESMTP id h0VJ4oq27414; Fri, 31 Jan 2003 12:04:50 -0700 Received: from mmans02.mma.maxtor.com ([134.6.232.101]) by mcoexc03.mlm.maxtor.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2653.13) id D4XRKYZ1; Fri, 31 Jan 2003 12:11:13 -0700 Received: from maxtor.com by mmans02.mma.maxtor.com (8.8.8/1.1.22.3/08May01-0432PM) id OAA0000002089; Fri, 31 Jan 2003 14:10:55 -0500 (EST) Date: Fri, 31 Jan 2003 14:10:54 -0500 Subject: Re: DEV_B_SIZE Content-Type: text/plain; charset=US-ASCII; format=flowed Mime-Version: 1.0 (Apple Message framework v551) Cc: David Laight , freebsd-fs@FreeBSD.ORG, tech-kern@netbsd.org To: Lord Isildur From: Steve Byan In-Reply-To: Message-Id: Content-Transfer-Encoding: 7bit X-Mailer: Apple Mail (2.551) 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 On Friday, January 31, 2003, at 01:51 PM, Lord Isildur wrote: > to just get the performance of aligned accesses, we dont need to modify > block sizes and such stuff. an an example, read the paper linked to > from > this; http://www.pdl.cmu.edu/PDL-FTP/stray/traxtent_abs.html > (brought to you by the same folks who did soft updates and raidframe) Thanks, I'm aware of the excellent CMU paper. In fact, if anyone wants a way to get the complete physical geometry of Maxtor SCSI disks just by reading mode-pages, email me and I can supply the details. My concern is with the proposed backward-compatibility mode, which I fear subtly breaks the failure semantics which systems with persistent storage rely upon to recover. Regards, -Steve -------- Steve Byan Design Engineer Maxtor Corp. MS 1-3/E23 333 South Street Shrewsbury, MA 01545 (508) 770-3414 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message