Date: Wed, 29 Nov 2006 17:07:01 +0100 (CET) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-stable@FreeBSD.ORG, chris@vindaloo.com Subject: Re: Problems unmounting/fssyncking extern UFS filesystem Message-ID: <200611291607.kATG71vU079631@lurza.secnetix.de> In-Reply-To: <1164750071.1074.39.camel@dagobah.vindaloo.com>
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Christopher Sean Hilton wrote: > 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? Right, unless the SCSI drive has a label saying "Quantum". Best regards Oliver PS: Quantum is today owned by maxtor, isn't it? I've lost track of HD manufacturers when Seagate bought Conner ... -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing Dienstleistungen mit Schwerpunkt FreeBSD: http://www.secnetix.de/bsd Any opinions expressed in this message may be personal to the author and may not necessarily reflect the opinions of secnetix in any way. "[...] one observation we can make here is that Python makes an excellent pseudocoding language, with the wonderful attribute that it can actually be executed." -- Bruce Eckel
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