Re: Writing large files onto sync mounted MMC corrupts the FS

[Artem B. Bityuckiy]

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.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/