Ovirt devel - Sep 2009 - ovirt node 1.0.3 iscsi errors

Good Morning,
I have successfully deployed Ovirt manager and 1 node (1.03 version).
All networks interfaces work fine.
I configure an ISCSI storage .
When I start a VM on the web management interface displays the  
following error:

Unable to find volume /dev/disk/by-id/iscsi-12939393 ecc ecc

I logged on the node and the path is present and it is a link to a  
valid iscsi disk.