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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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