From: David Woodhouse <dwmw2@infradead.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: Andreas Jellinghaus <aj@dungeon.inka.de>, linux-kernel@vger.kernel.org
Subject: Re: Compactflash cards dying?
Date: 04 Feb 2003 11:30:31 +0000 [thread overview]
Message-ID: <1044358231.3291.10.camel@passion.cambridge.redhat.com> (raw)
In-Reply-To: <20030204112406.GB737@atrey.karlin.mff.cuni.cz>
On Tue, 2003-02-04 at 11:24, Pavel Machek wrote:
> Well, if their translation layer at least *worked*, I'd be happy with
> it.
Would you? You fill up your FAT or EXT2 file system, then delete all
your files. There are lots and lots of sectors with now-unused data.
Then start filling it up again.
To accommodate your writes, the underlying translation layer is busily
garbage-collecting all those blocks which are _unused_, copying them
from one part of the flash to another to collect 'fresh' copies of data
together while reclaiming space from 'obsoleted' copies of changed
sectors.
Or you manage to find a vendor who sells reliable cards, hence decide
it's actually usable for real medium-term storage and start using EXT3
on it. You write out all your metadata (or even all your data) twice to
the device, and it hits the flash twice, because you can't tie in to the
_underlying_ journalling which it's already doing.
I wouldn't be happy.
--
dwmw2
next prev parent reply other threads:[~2003-02-04 11:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-02 22:30 Compactflash cards dying? Pavel Machek
2003-02-02 23:57 ` Willy Tarreau
2003-02-03 12:53 ` Pavel Machek
2003-02-03 0:36 ` Daniel Egger
2003-02-03 2:04 ` Martin K. Petersen
2003-02-03 8:39 ` Jörn Engel
2003-02-03 13:58 ` Martin K. Petersen
2003-02-03 8:50 ` Miquel van Smoorenburg
2003-02-03 7:12 ` Bryan Andersen
2003-02-03 14:08 ` Martin K. Petersen
2003-02-03 14:10 ` Padraig
2003-02-03 14:30 ` John Bradford
2003-02-03 14:25 ` John Bradford
2003-02-03 21:18 ` Bryan Andersen
2003-02-04 20:59 ` Bill Davidsen
2003-02-04 21:07 ` John Bradford
2003-02-03 7:30 ` Andreas Jellinghaus
2003-02-03 12:54 ` Pavel Machek
2003-02-03 23:12 ` David Woodhouse
2003-02-04 3:39 ` H. Peter Anvin
2003-02-04 11:24 ` Pavel Machek
2003-02-04 11:30 ` David Woodhouse [this message]
2003-02-04 19:28 ` Pavel Machek
2003-02-03 23:56 ` Roger Larsson
2003-02-04 0:10 ` David Woodhouse
2003-02-04 23:28 ` Pavel Machek
2003-02-04 0:34 ` Andrew McGregor
2003-02-04 23:27 ` Pavel Machek
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