Xen users - Oct 2007 - i can''t get xen to run off of a nbd share

I have read somewhere that nbd and gnbd shared devices can be used as
a disk device under xen.

i haven''t really seen any solid documentation about on how to get this
done,
but when doing a search on xen and nbd,
i came across a few examples of how to get this to run
http://w3.linux-magazine.com/issue/70/Xen_3_Virtualization.pdf
disk = [''nbd:ip.address.of.server port#, sda1,w'']

is this correct?
i have tried to get this to work, but i am getting this error message
Error: Device 2049 (vbd) could not be connected. Backend device not found.

i know that the nbd device is being shared properly.  I was able to
connect, and mount
it using nbd-client.

i am running xen 3.0.3 which is the packaged version in Ubuntu 7.04
feisty (ubuntu-xen-server package).

Can anyone help me?

TIA,
Tomoki

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