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Re: Debian router (compressed FS needs)

In message <[🔎] 1741.>
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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