To answer your question: Nova has a config option allow_resize_to_same_host that is False by default. If it is False the nova does not allow migrating or resize an instance to the host it is already on. So latest nova still supports migrating to the same host if configuration allows it.
To answer your question: Nova has a config option allow_resize_ to_same_ host that is False by default. If it is False the nova does not allow migrating or resize an instance to the host it is already on. So latest nova still supports migrating to the same host if configuration allows it.