Date: Tue, 28 Nov 2006 16:41:11 -0500 From: Christopher Sean Hilton <chris@vindaloo.com> To: Kevin Oberman <oberman@es.net> Cc: FreeBSD Stable <freebsd-stable@FreeBSD.ORG> Subject: Re: Problems unmounting/fssyncking extern UFS filesystem Message-ID: <1164750071.1074.39.camel@dagobah.vindaloo.com> In-Reply-To: <20061128195138.6B09C45096@ptavv.es.net> References: <20061128195138.6B09C45096@ptavv.es.net>
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On Tue, 2006-11-28 at 11:51 -0800, Kevin Oberman wrote: [ ... ] > The magic phrase is "buffer cache has been flushed". In the real world > of discs with cache there is no way to be certain when the data is > REALLY on the disc. That is why things get clobbered if the power is > cycled to the disc too soon after syncing and why a sleep (or typing > sync three times) is still a good idea and probably always will be. > Please understand that this is an honest question but isn't that true only of IDE heritage drives. E.g. If a SCSI drive with Tagged Queuing says that the the bits have been written doesn't it mean that the bits have really been written? -- Chris
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