unionfs question

[Christoph Höger]

Hi,

I have a more general question about unionfs:
I want to build a xen machine with a save base-image and a temporary 
write image that can be saved or thrown away on demand. So I thought 
about using unionfs to mount both these images as /.
The problem is: unionfs does not mount images but directories that are 
already mounted. So I would need to mount those two images somewhere 
else. Obviuosly this would happen somewhere above / (e.g. /workimage and 
/rootimage). Could unionfs handle this?
Or is there even a better way?

regards

christoph