Date: Thu, 21 Sep 2000 10:39:43 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Marius Bendiksen <mbendiks@eunet.no> Cc: Soren Schmidt <sos@freebsd.dk>, Terry Lambert <tlambert@primenet.com>, Archie Cobbs <archie@whistle.com>, fs@FreeBSD.ORG, sos@FreeBSD.ORG Subject: Re: disable write caching with softupdates? Message-ID: <Pine.BSF.4.10.10009211037340.24068-100000@InterJet.elischer.org> In-Reply-To: <Pine.BSF.4.05.10009211342490.38107-100000@login-1.eunet.no>
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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
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