Subject: Re: [POT] Which journalised filesystem ?
To: andre.dahlqvist@telia.com (=?iso-8859-1?Q?Andr=E9?= Dahlqvist)
Date: Thu, 4 Oct 2001 22:25:12 +0100 (BST)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20011003173448.C2337@telia.com> from "=?iso-8859-1?Q?Andr=E9?= Dahlqvist" at Oct 03, 2001 05:34:48 PM
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Message-Id: <E15pFzU-0004H7-00@the-village.bc.nu>
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Sender: linux-kernel-owner@vger.kernel.org

> > Alan mentioned this was something to do with the IBM hard disk
> > having strange write-cache properties that confuse ext3.
> 
> Which IBM harddrive(s) does this? How can one check if it does?

Its not specifically IBM, there are two sets of things to watch out for

-	Cache flush as a nop/unimplemented. This is legal in all but the
	most recent ATA specification. The spec has been tightened so that
	problem will go in time

-	Some IBM laptop drives appeared to fail to write back the cache on
	machine shutdown/suspend etc. The exact rights/wrongs/details on
	that one haven't been pinned down because the folks concerned
	swapped a couple of drives for different ones, saw the problem
	vanish and being a large organisation had the supplier replace the
	other fifty odd. 

Alan
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