From owner-freebsd-fs Fri Jan 31 11:50:44 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 E8B4737B401 for ; Fri, 31 Jan 2003 11:50:43 -0800 (PST) Received: from quic.net (rrcs-central-24-123-205-180.biz.rr.com [24.123.205.180]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3406F43E4A for ; Fri, 31 Jan 2003 11:50:43 -0800 (PST) (envelope-from utsl@quic.net) Received: from localhost (localhost [127.0.0.1]) (uid 1032) by quic.net with local; Fri, 31 Jan 2003 14:50:42 -0500 Date: Fri, 31 Jan 2003 14:50:42 -0500 To: Steve Byan , freebsd-fs@FreeBSD.ORG, tech-kern@netbsd.org Subject: Re: DEV_B_SIZE Message-ID: <20030131195042.GD6243@quic.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.3.28i From: Nathan Hawkins 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 Fri, Jan 31, 2003 at 02:10:54PM -0500, Steve Byan wrote: > 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. I'd be interested in that. Are those published? > 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. You might want to talk with Veritas. I'm pretty sure their Volume Manager's log subdisks assume 512-byte sectors. More generally, what impact would this have on existing RAID implementations, hardware or software? This is a potentially more damaging impact than filesystem semantics. ---Nathan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message