Re: Debian router (compressed FS needs)
In message <[🔎] 1741.192.168.1.40.1082736691.squirrel@192.168.1.2>
Bruno Gravato wrote:
> First of all... Hi!
Hi, Bruno :-)
> Some might question themselves about "How many writes can I do to a flash
> disk?", well it depends on the manufacturer, some have internal wear
> levelling mechanism like sandisk (there's a sandisk paper about this but I
> haven't the link here now). There is a nice discussion about this in some
Another big problem is: _when_ does the device perform the wear
levelling? For example, many (most ?) CompactFlash cards do this only
at power-on, so if your system does not get rebooted on a regular
base you better don't relay on any wear levelling on such devices.
> I feel like if I had forget to say something, but this is already getting
> to big so I'll end here for now :)
Well, maybe I should also point out that there are ways to make a
read-only filesystem look as if it was writable; this is very usefult
first to find out which files are actually writeen, and second to
redirect these writes to a (small) writable device or partition. For
more information about the "mini_fo" Overlay Filesystem for Embedded
Systems see http://www.denx.de, ftp://ftp.denx.de/pub/mini_fo/ and
especially http://www.denx.de/PDF/Diplomarbeit-MK-1.0-net.pdf
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
It is dangerous to be right on a subject on which the established
authorities are wrong. -- Voltaire
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