linux-ext4 - Re: ext2/3: document conditions when reliable operation is possible

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Message-ID: <20090829140428.282c27a4@lxorguk.ukuu.org.uk>
Date:	Sat, 29 Aug 2009 14:04:28 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	Rob Landley <rob@...dley.net>, Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	tytso@....edu, rdunlap@...otime.net, linux-doc@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: ext2/3: document conditions when reliable operation is possible

> I've heard rumors of disks that claim to support cache flushes but 
> really just ignore them, but have never heard any specifics of model 
> numbers, etc. which are known to do this, so it may just be legend. If 
> we do have such knowledge then we should really be blacklisting those 
> drives and warning the user that we can't ensure data integrity. (Even 
> powering down the system would be unsafe in this case.)

This should not be the case for any vaguely modern drive. The standard
requires the drive flushes the cache if sent the command and the size of
caches on modern drives rather require it.

Alan
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