From: Jarkko Lavinen <jarkko.lavinen@nokia.com>
To: "Artem B. Bityuckiy" <dedekind@yandex.ru>
Cc: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>,
linux-kernel@vger.kernel.org
Subject: Re: Writing large files onto sync mounted MMC corrupts the FS
Date: Thu, 2 Jun 2005 12:17:59 +0300 [thread overview]
Message-ID: <20050602091759.GA9161@angel.research.nokia.com> (raw)
In-Reply-To: <429EACC9.30303@yandex.ru>
On Thu, Jun 02, 2005 at 10:52:57AM +0400, ext Artem B. Bityuckiy wrote:
> So, we should first ask whether this happens with *new* MMC cards or
not.
Flash manufactorers typically claim 100k erase cycles -- some even 1M.
If FAT is updated after each written 512 byte block, filling 64MiB
card in synchronous mode would cause over 100k FAT updates. One
couldn't even fill a new 64MiB card without already breaking it.
With asynchronous mount, one could limit the dirty_ratio from proc to
reduce the sync time against sudden power loss. But wouldn't this have
the same adverse wearing effect as with synchronous mode once the
dirty_ratio is hit and writing still proceeds?
Jarkko Lavinen
prev parent reply other threads:[~2005-06-02 9:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-01 9:13 Jarkko Lavinen
2005-06-01 13:10 ` Lennart Sorensen
2005-06-02 6:52 ` Artem B. Bityuckiy
2005-06-02 9:17 ` Jarkko Lavinen [this message]
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