I guys, I have the same error but my two servers have the same CPU mode : Host 1: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 8 On-line CPU(s) list: 0-7 Thread(s) per core: 1 Core(s) per socket: 4 Socket(s): 2 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 23 Stepping: 6 CPU MHz: 2992.446 BogoMIPS: 5985.06 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 6144K NUMA node0 CPU(s): 0-7 Host2 : Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 8 On-line CPU(s) list: 0-7 Thread(s) per core: 1 Core(s) per socket: 4 Socket(s): 2 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 23 Stepping: 10 CPU MHz: 2992.632 BogoMIPS: 5985.06 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 6144K NUMA node0 CPU(s): 0-7 Error in nova-api.log : 2013-08-26 23:25:50.012 ERROR nova.api.openstack.compute.contrib.admin_actions [req-5f28e5de-1312-4e07-81e7-893f439d7ccb f235975a22d64ca3a28f4b5dc1cbceb8 00eb7054314244fca82cf79f2caa8ff7] Live migration of instance 32e94646-2a3a-4c53-b169-becd433880eb to host HOST01 failed 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions Traceback (most recent call last): 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/contrib/admin_actions.py", line 284, in _migrate_live 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions disk_over_commit, host) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 134, in inner 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions return f(self, context, instance, *args, **kw) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 2454, in live_migrate 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions disk_over_commit, instance, host_name) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/scheduler/rpcapi.py", line 110, in live_migration 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions dest=dest)) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/proxy.py", line 80, in call 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions return rpc.call(context, self._get_topic(topic), msg, timeout) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/__init__.py", line 140, in call 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions return _get_impl().call(CONF, context, topic, msg, timeout) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/impl_kombu.py", line 798, in call 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions rpc_amqp.get_connection_pool(conf, Connection)) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 612, in call 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions rv = list(rv) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 561, in __iter__ 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions raise result 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions RemoteError: Remote error: InvalidCPUInfo_Remote Unacceptable CPU info: CPU doesn't have compatibility. 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 0 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions Refer to http://libvirt.org/html/libvirt-libvirt.html#virCPUCompareResult 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions Traceback (most recent call last): 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 430, in _process_data 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions rval = self.proxy.dispatch(ctxt, version, method, **args) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/dispatcher.py", line 133, in dispatch 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions return getattr(proxyobj, method)(ctxt, **kwargs) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 117, in wrapped 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions temp_level, payload) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__ 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions self.gen.next() 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 94, in wrapped 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions return f(self, context, *args, **kw) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 3047, in check_can_live_migrate_destination 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions block_migration, disk_over_commit) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2855, in check_can_live_migrate_destination 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions self._compare_cpu(source_cpu_info) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2989, in _compare_cpu 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions raise exception.InvalidCPUInfo(reason=m % locals()) 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions InvalidCPUInfo: Unacceptable CPU info: CPU doesn't have compatibility. 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 0 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions Refer to http://libvirt.org/html/libvirt-libvirt.html#virCPUCompareResult 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions [u'Traceback (most recent call last):\n', u' File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 430, in _process_data\n rval = self.proxy.dispatch(ctxt, version, method, **args)\n', u' File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/dispatcher.py", line 133, in dispatch\n return getattr(proxyobj, method)(ctxt, **kwargs)\n', u' File "/usr/lib/python2.7/dist-packages/nova/scheduler/manager.py", line 117, in live_migration\n context, ex, {})\n', u' File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__\n self.gen.next()\n', u' File "/usr/lib/python2.7/dist-packages/nova/scheduler/manager.py", line 96, in live_migration\n block_migration, disk_over_commit)\n', u' File "/usr/lib/python2.7/dist-packages/nova/scheduler/driver.py", line 215, in schedule_live_migration\n disk_over_commit)\n', u' File "/usr/lib/python2.7/dist-packages/nova/compute/rpcapi.py", line 240, in check_can_live_migrate_destination\n ctxt, destination, None))\n', u' File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/proxy.py", line 80, in call\n return rpc.call(context, self._get_topic(topic), msg, timeout)\n', u' File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/__init__.py", line 140, in call\n return _get_impl().call(CONF, context, topic, msg, timeout)\n', u' File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/impl_kombu.py", line 798, in call\n rpc_amqp.get_connection_pool(conf, Connection))\n', u' File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 612, in call\n rv = list(rv)\n', u' File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 561, in __iter__\n raise result\n', u'InvalidCPUInfo_Remote: Unacceptable CPU info: CPU doesn\'t have compatibility.\n\n0\n\nRefer to http://libvirt.org/html/libvirt-libvirt.html#virCPUCompareResult\nTraceback (most recent call last):\n\n File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 430, in _process_data\n rval = self.proxy.dispatch(ctxt, version, method, **args)\n\n File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/dispatcher.py", line 133, in dispatch\n return getattr(proxyobj, method)(ctxt, **kwargs)\n\n File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 117, in wrapped\n temp_level, payload)\n\n File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__\n self.gen.next()\n\n File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 94, in wrapped\n return f(self, context, *args, **kw)\n\n File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 3047, in check_can_live_migrate_destination\n block_migration, disk_over_commit)\n\n File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2855, in check_can_live_migrate_destination\n self._compare_cpu(source_cpu_info)\n\n File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2989, in _compare_cpu\n raise exception.InvalidCPUInfo(reason=m % locals())\n\nInvalidCPUInfo: Unacceptable CPU info: CPU doesn\'t have compatibility.\n\n0\n\nRefer to http://libvirt.org/html/libvirt-libvirt.html#virCPUCompareResult\n\n']. 2013-08-26 23:25:50.012 9958 TRACE nova.api.openstack.compute.contrib.admin_actions 2013-08-26 23:25:50.015 INFO nova.api.openstack.wsgi [req-5f28e5de-1312-4e07-81e7-893f439d7ccb f235975a22d64ca3a28f4b5dc1cbceb8 00eb7054314244fca82cf79f2caa8ff7] HTTP exception thrown: Live migration of instance 32e94646-2a3a-4c53-b169-becd433880eb to host HOST01 failed 2013-08-26 23:25:50.017 INFO nova.osapi_compute.wsgi.server [req-5f28e5de-1312-4e07-81e7-893f439d7ccb f235975a22d64ca3a28f4b5dc1cbceb8 00eb7054314244fca82cf79f2caa8ff7] 172.17.1.1 "POST /v2/00eb7054314244fca82cf79f2caa8ff7/servers/32e94646-2a3a-4c53-b169-becd433880eb/action HTTP/1.1" status: 400 len: 331 time: 4.1423299 nova.conf : libvirt_cpu_mode=custom libvirt_cpu_model=kvm64 live_migration_bandwidth=0 live_migration_flag=VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER live_migration_retry_count=30 live_migration_uri=qemu+tcp://%s/system Can it be related ? Thanks