linux-kernel - Re: Compact Flash Question

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Message-ID: <4822FF8D.7020805@rtr.ca>
Date:	Thu, 08 May 2008 09:26:37 -0400
From:	Mark Lord <liml@....ca>
To:	Bart Van Assche <bart.vanassche@...il.com>
Cc:	Stéphane ANCELOT <sancelot@...e.fr>,
	Helge Hafting <helge.hafting@...el.hist.no>,
	Tomasz Chmielewski <mangoo@...g.org>,
	LKML <linux-kernel@...r.kernel.org>, YSadgat1@...e.com,
	linux-os@...logic.com, Alan <alan@...rguk.ukuu.org.uk>,
	Linux IDE <linux-ide@...r.kernel.org>,
	Jeff Woods <jeff@...fwoods.us>
Subject: Re: Compact Flash Question

Bart Van Assche wrote:
> On Wed, May 7, 2008 at 5:01 PM, Stéphane ANCELOT <sancelot@...e.fr> wrote:
>> we use  silicon systems CF  with wear leveling inside  , we write a few
>> kb data back each 1/4 h  on it.(log /tmp files  are redirected to ram)
> 
> Silicon Systems CompactFlashes are the among the most reliable
> CompactFlashes I have used in embedded devices. See also
> http://www.siliconsystems.com/silicondrive/whitepapers/SSWP03-Endurance-R.pdf
> for a whitepaper that explains their wear leveling and error
> correction algorithms. Furthermore, Silicon Systems has a technology
> called SiSMART that allows to monitor by how far the CompactFlash is
> worn out, such that it can be monitored whether or not it is time to
> replace the CompactFlash. (Note: I am not affiliated in any way to
> Silicon Systems.)
..

Mmm.. according to that document, the "dynamic wear leveling" devices
might benefit from having Linux issue CF-Erase commands to unallocated sectors,
so that the onboard CF controller can then add those sectors to the wear-leveling
rotation scheme.

There was discussion at LSF'08 about possible filesystem hooks that could
be used for this (and other) purposes when deleting files.

Cheers
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