[yocto] Which filesystem for target?

[Paul Eggleton]

On Friday 28 October 2011 23:11:22 Chris Tapp wrote:
> Which is the 'best' filesystem to use for an embedded device that's
> using a CF card?
> 
> It needs to survive loss-of-power, have a RO root filesystem, allow
> user configuration data to persist and (ideally) only use 'Busybox'
> commands.
> 
> This seems to imply the use of a partition for booting (mount RO) and
> a second partition or a loop-device on the boot partition for
> persistent storage.
> 
> I would normally go for ext3, but Busybox doesn't support it (afaik).
> The Busybox tune2fs also only supports -L, so I can't stop 'disk needs
> checking after <n> mounts' messages.
> 
> Is btrfs a suitable alternative?

Arnd Bergmann gave a talk at ELCE on flash drive performance (something he has 
done quite a lot of research on); I did not attend but Darren and I spoke to 
him later on, and if I recall correctly in his tests btrfs performed the best. 
Hopefully the talk video will be available soon thanks to the folks at Free 
Electrons; in the mean time there's an earlier article by Arnd on this topic 
here:

http://lwn.net/Articles/428584/

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre