To clarify, what I specifically see is failure to launch on LVM backend where the flavor has an ephemeral disk, because it seems to be seeking an actual image on disk to expand into the LV.

2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [req-39441537-6c9e-41aa-a11b-96ab7656903d dcf63bda28a74757a61ce65edcf4f5ee d042e1a3fc3d49a6b1b549eed914a7eb - - -] [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] Instance failed to spawn 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] Traceback (most recent call last): 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2156, in _build_resources 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] yield resources 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2009, in _build_and_run_instance 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] block_device_info=block_device_info) 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2527, in spawn 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] admin_pass=admin_password) 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2997, in _create_image 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] specified_fs=specified_fs) 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py", line 252, in cache 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] if size > self.get_disk_size(base): 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py", line 306, in get_disk_size 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] return disk.get_disk_size(name) 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] File "/usr/lib/python2.7/dist-packages/nova/virt/disk/api.py", line 173, in get_disk_size 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] return images.qemu_img_info(path).virtual_size 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] File "/usr/lib/python2.7/dist-packages/nova/virt/images.py", line 58, in qemu_img_info 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] raise exception.InvalidDiskInfo(reason=msg) 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] InvalidDiskInfo: Disk info file is invalid: Path does not exist /var/lib/nova/instances/_base/ephemeral_5_0706d66 
2016-08-11 18:27:01.443 96542 ERROR nova.compute.manager [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] 
2016-08-11 18:27:07.830 96542 ERROR nova.compute.manager [req-39441537-6c9e-41aa-a11b-96ab7656903d dcf63bda28a74757a61ce65edcf4f5ee d042e1a3fc3d49a6b1b549eed914a7eb - - -] [instance: 741c239b-97ca-43ff-b890-4c77b1f11394] Build of instance 741c239b-97ca-43ff-b890-4c77b1f11394 aborted: Disk info file is invalid: Path does not exist /var/lib/nova/instances/_base/ephemeral_5_0706d66