From owner-freebsd-fs Fri Sep 22 11:47:59 2000 Delivered-To: freebsd-fs@freebsd.org Received: from InterJet.elischer.org (c421509-a.pinol1.sfba.home.com [24.7.86.9]) by hub.freebsd.org (Postfix) with ESMTP id 46AC937B42C; Fri, 22 Sep 2000 11:47:57 -0700 (PDT) Received: from InterJet.elischer.org (InterJet.elischer.org [192.168.1.1]) by InterJet.elischer.org (8.9.1a/8.9.1) with ESMTP id KAA24087; Thu, 21 Sep 2000 10:39:44 -0700 (PDT) Date: Thu, 21 Sep 2000 10:39:43 -0700 (PDT) From: Julian Elischer To: Marius Bendiksen Cc: Soren Schmidt , Terry Lambert , Archie Cobbs , fs@FreeBSD.ORG, sos@FreeBSD.ORG Subject: Re: disable write caching with softupdates? In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org I know of no non-crippled hardware in this case... i.e. I have yet to see a drive that will complete a write correctly in teh case of a power fail, after having told the system that it did it correctly. The problem is that if two writes are re-ordered by the drive soft updates may fail.... the second write may depend on teh first having succeeded.. On Thu, 21 Sep 2000, Marius Bendiksen wrote: > > > The ATA drives Whistle is using, which is what I'm assuming > > > Archie is on about, do _not_ support this facility. As far > > > as I can tell, there wre some SCSI drives manufactured by > > > IBM at one time which could do this, and some lab drives at > > > Quantum (also SCSI). > > Hmm, well, lets disable this then, there is no need to complicate > > things :) > > Please make this conditional, as people with non-crippled hardware might > want to employ the write cache. A sysctl or build option would be best. > > Marius > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-fs" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message