linux-kernel - Re: UBIFS vs Logfs (was [RFC PATCH] UBIFS

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Message-ID: <47F332FA.9000603@yandex.ru>
Date:	Wed, 02 Apr 2008 10:17:14 +0300
From:	Artem Bityutskiy <dedekind@...dex.ru>
To:	Willy Tarreau <w@....eu>
CC:	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
	Tomasz Chmielewski <mangoo@...g.org>,
	LKML <linux-kernel@...r.kernel.org>, penberg@...helsinki.fi,
	Jörn Engel <joern@...fs.org>,
	ext-adrian.hunter@...ia.com, jwboyer@...il.com
Subject: Re: UBIFS vs Logfs (was [RFC PATCH] UBIFS - new flash file system)

Willy Tarreau wrote:
> One of the problem is that unless you crash-test your flash cards, you will
> never know if their wear-leveling algorithm is fine or not. And I suspect
> that nowadays, due to very large consumer demand, flash cards price drop
> at the cost of reliability. I think that most of those not flagged
> "industrial-grade" do absolutely zero wear-leveling, because they are sold
> to people using them in digital cameras, and they will never kill their
> device with such a usage.

Sure, I know about this problem. My point was that in this case it is wiser
to use bare flash and put JFFS2 on it, instead of using this black box
MMC/etc and then put JFFS2 on it.

> I'm certainly not the only one with this requirement. A lot of embedded
> motherboards come with IDE compactflash connectors. This is very convenient,
> but if you need to keep informations between reboots, you have to write to
> the device anyway. If you need to do that very often, either you pray for
> the device to be very reliable, or you take all the chances on your side
> by adding your own wear-leveling "just in case".

OK. Fair enough. Although stuff exists, but this does not necessarily mean
this a good design :-)

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
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