--- volumeops.py	2017-07-13 15:50:31.271262288 -0300
+++ volumeops.py-new	2017-07-14 09:28:45.656943733 -0300
@@ -490,8 +490,11 @@
         # Volume's backing is relocated now; detach the old vmdk if not done
         # already.
         if not detached:
-            self.detach_disk_from_vm(volume_ref, instance, original_device,
-                                     destroy_disk=True)
+            try:
+                self.detach_disk_from_vm(volume_ref, instance, original_device,
+                                         destroy_disk=True)
+            except oslo_vmw_exceptions.FileNotFoundException:
+                pass
 
         # Attach the current volume to the volume_ref
         self.attach_disk_to_vm(volume_ref, instance,