[ovirt-users] Cannot create snapshot_illegal disk

Dear all, Thank you for your time to read this post first. In the same host, there are four virtual machines. Only one virtual machine that i cannot create a snapshot for backup usage. I have no idea what is happening and how to solve it. Would you guys help me and give some suggestion to me? Please kindly check the following links. I think those information including two picture of oVirt web manager, engine.log and vdsm.log, would be useful for finding the issue. *engine.log* https://drive.google.com/open?id=0B8dxamAkVEYdeFBOdlFUbnY1cFU *vdsm.log* https://drive.google.com/open?id=0B8dxamAkVEYddFh6dzc0VkVRMk0 *Two pictures of oVirt web manger:* *Before created the snapshot:* https://drive.google.com/open?id=0B8dxamAkVEYda2d0SzVvc3ZMTFU *After created the snapshot:* https://drive.google.com/open?id=0B8dxamAkVEYdV3lUVUJ0Zy1LeGc I am really looking forward for you guys' reply. Thank you again for your time to assist me. Regards, Terry