GY> I'm a little confusing of MigrateVirtualSystemToSystem method，who GY> can tell me what does "DestinationSystem" refer to? It different GY> from DestinationHost which can be passed by a simple ip GY> address. As a reference, the DestinationSystem's Name have to be GY> parsed below. Then what on earth does it mean? DestinationSystem is a REF of a CIM_System to migrate to. Currently, the Name key of the system is used as the hostname. I still need to update the schema for the migration calls and validate that the Name key is the appropriate one to use. For now, using DestinationHost and MigrateVirtualSystemToHost is probably the best way for now. The MigrateVirtualSystemToSystem call is just another way to do it, if you have a REF of the destination system. -- Dan Smith IBM Linux Technology Center Open Hypervisor Team email: danms@us.ibm.com