On Sat, Feb 11, 2006 at 09:43:47AM +0100, Philipp Börker wrote:
> I am hacking around with a portable linux media-player. This 
> media-player uses a compressed ramdisk (cramfs) to hold its mini-linux 
> distribution which therefore can't be modified by a user as the cramfs 
> is read-only. I already added unionfs to the firmware and specify the 
> directories in this order: /opt=ro:/progfs/unionfs/opt=rw

Branches are accessed left to right, so I think you want:

/progfs/unionfs/opt=rw:/opt=ro

> There is now a major change in behaviour of the media-player, the
> harddisk doesn't spin down anymore or more precisely it spins down
> just to spin up again immediately.

Try to mount the union the other way around (see above).

> Will unionfs always access all directories specified for a union
> upon a read operation and therefore make the harddisk spin up?

It shouldn't do that, my guess it that unionfs is a little confused
because the branches are in the "wrong" order.

Jeff.

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