From: "Artem B. Bityuckiy" <dedekind@yandex.ru>
To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com>, linux-kernel@vger.kernel.org
Subject: Re: Writing large files onto sync mounted MMC corrupts the FS
Date: Thu, 02 Jun 2005 10:52:57 +0400 [thread overview]
Message-ID: <429EACC9.30303@yandex.ru> (raw)
In-Reply-To: <20050601131006.GL23621@csclub.uwaterloo.ca>
Lennart Sorensen wrote:
> In other words: Don't use sync with flash media. It's a horribly bad
> idea, and if you look into how flash works (at least the cheaper ones)
> you will realize why. Anything with a limited number of writes allowed
> to each sector should avoid rewriting the same sector again and again,
> and that is what sync does when you use filesystems designed for disks
> rather than flash. JFFS was designed for flash use and rotates the
> sectors it uses to store filesystem meta data and has spare space in the
> filesystem to do wearleveling at the filesystem level. vfat and ext2/3
> do not, and it shows. At least write caching/delayed write back
> elliminates the worst of the rewriting of the meta data sectors.
>
So, we should first ask whether this happens with *new* MMC cards or not.
--
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.
next prev parent reply other threads:[~2005-06-02 6:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-01 9:13 Writing large files onto sync mounted MMC corrupts the FS Jarkko Lavinen
2005-06-01 13:10 ` Lennart Sorensen
2005-06-02 6:52 ` Artem B. Bityuckiy [this message]
2005-06-02 9:17 ` Jarkko Lavinen
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