After walking through following steps, foreman looses information about the virtual machines hard drives:
1. power off vm
2. clone disk(s) to another kvmhost (both kvmhosts are in foreman)
3. undefine from source and define using exact copy of xml on target kvmhost
4. go to the target compute resource in foreman and associate vm:s

Foreman now knows that the VM is on another kvmhost and console works, but the information about disks is empty and if I try delete the host, the disks associated will not get deleted as they should.