Date: Sat, 17 Oct 1998 13:48:25 -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: <199810171748.NAA26674@bilver.magicnet.net> In-Reply-To: <19981017191758.A13174@gvr.org> from Guido van Rooij at "Oct 17, 98 07:17:58 pm"
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Guido van Rooij recently said: > On Fri, Oct 16, 1998 at 07:58:17PM +0000, Terry Lambert wrote: > > The errors seen are a result of uncommitted data in the drive cache, > > not power spikes and gremlins. The interaction is well understood, > > and on firm footing unrelated to Stephan King novels. > I always thought a drive will always be able to flush its write cache > to disk, even when power fails. Not all do. The high-end IBM's do/did. They used the inertia of the spinnging platters to generate enough current to flush the buffers to disk. There aren't a lot of drives that do it. With most drives, power off means driving in the dark. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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