Date: Wed, 14 Oct 1998 09:48:52 -0400 (EDT) From: Bill Vermillion <bill@bilver.magicnet.net> To: freebsd-fs@FreeBSD.ORG Subject: Re: filesystem safety and SCSI disk write caching Message-ID: <199810141348.JAA10202@bilver.magicnet.net> In-Reply-To: <199810140518.XAA15040@pluto.plutotech.com> from "Justin T. Gibbs" at "Oct 13, 98 11:11:41 pm"
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Justin T. Gibbs recently said: > >> >It doesn't, since "# of anomalies == 0" with write caching > >> >disabled. > >> > >> This doesn't follow. If the cache is disabled, it doesn't > >> matter if the drive loses power due to hitting the reset > >> button. We already know that losing power on a drive that > >> cached data will not work. > >We do? > Of course we do. Why do you think my position on this subject has > always been, "Write caching is fine so long as you use a UPS"? There was at least one model of IBM's high-end SCSI drives which when power was lost, would use the inertia from the spinning platters to generate current from the motor, in order to flush the on-board drive cache. Anyone recall that model number? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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