create volume from an image

["Li, Chen" <chen.li@xxxxxxxxx>]

I'm using Ceph RBD for both Cinder and Glance. Cinder and Glance are installed in two machines.

I have get information from many place that when cinder and glance both using Ceph RBD, then no real data transmit will happen because of copy on write.

But the truth is when i run the command:
cinder create --image-id 6565d775-553b-41b6-9d5e-ddb825677706 --display-name test 3
I can still get network data traffic between cinder and glance.

And I check the cinder code, the image_location is None (cinder/volume/manager.py), which makes cinder will failed running cloned = self.driver.clone_image(volume_ref, image_location).

Is this a OpenStack (cinder or glance )bug  ?

Or I have miss and configuration?

 

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