[libvirt] Error saving/restoring VM with attached disks

Hi there, I have been playing with libvirt/KVM on saving the VM to a checkpoint file and restoring it from this file. It has worked very well for me on my RHEL-5.5 setup, until I added hot-plugged volumes. If I add a volume to a running VM using "virsh attach-disk" and then call "virsh save". The checkpoint file was successfully written and VM stopped. However, I get errors restoring it with "virsh restore": $ virsh restore checkpoint error: Failed to restore domain from checkpoint error: operation failed: failed to start VM I did two thinngs to narrow down the problem: 1. If  I manually remove the lines of attached volume from the checkpoint file, then it restores fine. 2. If I have the additioinal volumes in the original XML template instead of hot-plugging them on the fly, the save/restore work very well. So I think the problem is in save/restore hot-plugged volumes. Do you think this is a bug or an expected behaviour? Should I file a bug report? Any fix already? Thank you very much. Shi -- Shi Jin, PhD