From: Ivan Djelic <ivan.djelic@parrot.com>
To: Ricard Wanderlof <ricard.wanderlof@axis.com>
Cc: "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
Artem Bityutskiy <dedekind1@gmail.com>
Subject: Re: UBIFS recovery fails
Date: Tue, 18 Oct 2011 10:42:22 +0200 [thread overview]
Message-ID: <20111018084222.GC5997@parrot.com> (raw)
In-Reply-To: <Pine.LNX.4.64.1110181007100.30940@lnxricardw.se.axis.com>
On Tue, Oct 18, 2011 at 09:11:54AM +0100, Ricard Wanderlof wrote:
>
> On Mon, 17 Oct 2011, Artem Bityutskiy wrote:
>
> > [...] Unfortunately, no one really invested time into making UBIFS
> > support MLC very well. It needs some more work. It also have some issues
> > related to unstable bits in modern SLC.
> >
> > In short - if you want to use UBIFS on MLC - you should not have unclean
> > reboots. If you want to make UBIFS 100% uclean-reboot save on MLC - you
> > need to work on it some more.
> >
> > We (the original authors) developed and tested it on very robust SLC
> > NAND.
>
> Do you have any specifics on what the issues are with MLC ?
Besides unstable bits, lower endurance, higher ecc requirements and NOP1, there
is a "page pairing" phenomenon which is not handled by UBI/UBIFS AFAIK.
When you cut power during a page write, you may lose data in another (paired)
previously programmed page.
BR,
--
Ivan
next prev parent reply other threads:[~2011-10-18 8:42 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-17 13:29 UBIFS recovery fails Daniel Kuhn
2011-10-17 20:17 ` Artem Bityutskiy
2011-10-18 8:11 ` Ricard Wanderlof
2011-10-18 8:42 ` Ivan Djelic [this message]
2011-10-20 16:37 ` Artem Bityutskiy
2011-10-20 16:36 ` Artem Bityutskiy
2011-10-18 8:29 ` Ivan Djelic
2011-10-19 15:15 ` Artem Bityutskiy
2011-10-19 17:27 ` Ivan Djelic
2011-10-18 12:47 ` Jean-Sébastien Gagnon
2011-10-18 14:54 ` Ivan Djelic
2011-10-18 15:10 ` Jean-Sébastien Gagnon
2011-10-18 15:32 ` Ivan Djelic
2011-10-18 16:05 ` Jean-Sébastien Gagnon
2011-10-19 6:50 ` Ricard Wanderlof
2011-10-19 10:22 ` Ivan Djelic
2011-10-19 12:17 ` Atlant Schmidt
2011-10-19 12:52 ` Ricard Wanderlof
2011-10-19 13:30 ` Atlant Schmidt
2011-10-20 16:43 ` Artem Bityutskiy
2011-10-24 7:00 ` Ricard Wanderlof
2011-10-29 19:43 ` Artem Bityutskiy
2011-10-20 14:14 ` Artem Bityutskiy
2011-10-18 15:29 ` Daniel Kuhn
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