From: Asdo <asdo@shiftmail.org>
Subject: Re: Sync does not flush to disk!?
Date: Fri, 08 Jun 2012 15:57:04 +0200
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 <20120608223332.5fe49193@notabene.brown> <4FD202CD.7000309@turmel.org>
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Cc: NeilBrown <neilb@suse.de>, linux-raid <linux-raid@vger.kernel.org>,
	linux-ext4@vger.kernel.org
To: Phil Turmel <philip@turmel.org>
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On 06/08/12 15:49, Phil Turmel wrote:
>
> To put it another way:  You can't safely access ext filesystems via
> raw devices in two systems.  The kernel cache won't be synchronized,
> and you almost certainly *will* corrupt the contents.

Thanks both of you for your explanations

I might say that it seems to me a bad design: never before I saw a cache 
that is not updated by writes.
Here the cache content is *older* than the data on the real devices!?
if it was *newer*, there are known cases (writeback cache not flushed 
yet), but *older*... never seen.

Thanks