Issue

Error when launching the instance with:

Found duplicate drive address for disk with target name 'sda' controller='0' bus='0' target='0' unit='0'

Full Traceback available:

 Instance failed to spawn
 Traceback (most recent call last):
   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2087, in _build_resources
     yield resources
   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1928, in _build_and_run_instance
     block_device_info=block_device_info)
   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2674, in spawn
     destroy_disks_on_failure=True)
   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5013, in _create_domain_and_network
     destroy_disks_on_failure)
   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
     self.force_reraise()
   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
     six.reraise(self.type_, self.value, self.tb)
   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4985, in _create_domain_and_network
     post_xml_callback=post_xml_callback)
   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4896, in _create_domain
     guest = libvirt_guest.Guest.create(xml, self._host)
   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py", line 129, in create
     encodeutils.safe_decode(xml))
   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
     self.force_reraise()
   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
     six.reraise(self.type_, self.value, self.tb)
   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/guest.py", line 125, in create
     domain = host.write_instance_config(xml)
   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/host.py", line 906, in write_instance_config
     return self.get_connection().defineXML(xml)
   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 186, in doit
     result = proxy_call(self._autowrap, f, *args, **kwargs)
   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 144, in proxy_call
     rv = execute(f, *args, **kwargs)
   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 125, in execute
     six.reraise(c, e, tb)
   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 83, in tworker
     rv = meth(*args, **kwargs)
   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3585, in defineXML
     if ret is None:raise libvirtError('virDomainDefineXML() failed', conn=self)
 libvirtError: unsupported configuration: Found duplicate drive address for disk with target name 'sda' controller='0' bus='0' target='0' unit='0'