my customer is having performace problems in his environment. In a dedicated environment there is no way to deploy a VMWARE image. Customer is using only openxen. I heard with a special approvment its possible to get a insaller for a RetHAT OS. This woulld really help to get OPM in place. Or is it possible to convert the OVF package to a XEN server format. Unfortunatly there is only a way for citrix xen server not OPEN XEN: http://support.citrix.com/article/CTX116603
But i believe it should be not much work to import a citrix XEN image to open xen server.