From owner-freebsd-fs Fri Jan 31 11:42:58 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 11D6037B401 for ; Fri, 31 Jan 2003 11:42:57 -0800 (PST) Received: from sccrmhc03.attbi.com (sccrmhc03.attbi.com [204.127.202.63]) by mx1.FreeBSD.org (Postfix) with ESMTP id 77BB743F3F for ; Fri, 31 Jan 2003 11:42:56 -0800 (PST) (envelope-from julian@elischer.org) Received: from interjet.elischer.org (12-232-168-4.client.attbi.com[12.232.168.4]) by sccrmhc03.attbi.com (sccrmhc03) with ESMTP id <2003013119425500300jva6me>; Fri, 31 Jan 2003 19:42:55 +0000 Received: from localhost (localhost.elischer.org [127.0.0.1]) by InterJet.elischer.org (8.9.1a/8.9.1) with ESMTP id LAA46067; Fri, 31 Jan 2003 11:42:53 -0800 (PST) Date: Fri, 31 Jan 2003 11:42:53 -0800 (PST) From: Julian Elischer To: Steve Byan Cc: freebsd-fs@FreeBSD.ORG, tech-kern@netbsd.org Subject: Re: DEV_B_SIZE In-Reply-To: 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 On Fri, 31 Jan 2003, Steve Byan wrote: > > On Friday, January 31, 2003, at 01:16 PM, Julian Elischer wrote: > > > > > Recovery algorythms might have to deal with this (should we actually > > decide to write one.. :-). > > > > Particularly if the block being written was the 1st, but the other 7 > > blocks contain data that the OS has no way of knowing that they are in > > jeopardy. In other words, I might know that block 1 is in danger and > > put > > it in a write log, (in a logging filesystem) but I have no way of > > knowing that the other 7 are in danger, so they may not be in the write > > log (assuming thAat the write log only holds the last N transactions.). > > I'd say that this means that the drive should hold the active 4k block > > in nvram or something.. > > > > You seem to have considered this but I'm in agreement that it could > > prove "nasty" in exactly the cases that are most important.. > > people use write logging etc. in cases where they care about the data > > and recovery time. these are exactly the people who are going to be the > > most pissed off to lose their data. .. > > Thanks, may I forward your response on to the committee? sure.. correct the spelling though :-) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message