Hi, I updated my engine and 1 host to 4.2 from 4.1 and now I cannot start a VM and get this error: "UnsupportedType: Unsupported {} for ioTune". My other 6 4.1 hosts are able to start VM normally with the new 4.2 engine. My VM has this inside: <iotune read_bytes_sec="0" read_iops_sec="100" total_bytes_sec="0" total_iops_sec="0" write_bytes_sec="0" write_iops_sec="100"/> error: 1. 2018-05-17 14:30:38,006+0200 ERROR (vm/0d53dd5d) [virt.vm] (vmId='0d53dd5d-ef16-4763-bbdc-2dc173087bf5') The vm start process failed (vm:943) 2. Traceback (most recent call last): 3. File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 872, in _startUnderlyingVm 4. self._run() 5. File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2882, in _run 6. self._domDependentInit() 7. File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2458, in _domDependentInit 8. self._vmDependentInit() 9. File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2495, in _vmDependentInit 10. self._sync_metadata() 11. File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 5158, in _sync_metadata 12. self._md_desc.dump(self._dom) 13. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 509, in dump 14. md_xml = self._build_xml() 15. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 721, in _build_xml 16. md_elem = self._build_tree(namespace, namespace_uri) 17. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 711, in _build_tree 18. dev_elem = _dump_device(metadata_obj, data) 19. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 800, in _dump_device 20. elems.append(_dump_device_spec_params(md_obj, value)) 21. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 866, in _dump_device_spec_params 22. spec_params_elem = md_obj.dump(_SPEC_PARAMS, **value) 23. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 229, in dump 24. _keyvalue_to_elem(self._add_ns(key), value, elem) 25. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 916, in _keyvalue_to_elem 26. raise UnsupportedType(key, value) 27. UnsupportedType: Unsupported {} for ioTune 28. 2018-05-17 14:30:38,006+0200 INFO (vm/0d53dd5d) [virt.vm] (vmId='0d53dd5d-ef16-4763-bbdc-2dc173087bf5') Changed state to Down: Unsupported {} for ioTune (code=1) (vm:1683) 29. 2018-05-17 14:30:38,007+0200 ERROR (vm/0d53dd5d) [root] FINISH thread <Thread(vm/0d53dd5d, stopped daemon 140237644748544)> failed (concurrent:201) 30. Traceback (most recent call last): 31. File "/usr/lib/python2.7/site-packages/vdsm/common/concurrent.py", line 194, in run 32. ret = func(*args, **kwargs) 33. File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 944, in _startUnderlyingVm 34. self.setDownStatus(ERROR, vmexitreason.GENERIC_ERROR, str(e)) 35. File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 1685, in setDownStatus 36. self._update_metadata() 37. File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 5145, in _update_metadata 38. self._sync_metadata() 39. File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 5158, in _sync_metadata 40. self._md_desc.dump(self._dom) 41. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 509, in dump 42. md_xml = self._build_xml() 43. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 721, in _build_xml 44. md_elem = self._build_tree(namespace, namespace_uri) 45. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 711, in _build_tree 46. dev_elem = _dump_device(metadata_obj, data) 47. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 800, in _dump_device 48. elems.append(_dump_device_spec_params(md_obj, value)) 49. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 866, in _dump_device_spec_params 50. spec_params_elem = md_obj.dump(_SPEC_PARAMS, **value) 51. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 229, in dump 52. _keyvalue_to_elem(self._add_ns(key), value, elem) 53. File "/usr/lib/python2.7/site-packages/vdsm/virt/metadata.py", line 916, in _keyvalue_to_elem 54. raise UnsupportedType(key, value) 55. UnsupportedType: Unsupported {} for ioTune