Hi, We (bloomberg) are preparing to roll out kilo into production and one thing is causing a lot of grief. I wonder if anyone else has encountered it. We run BCPC (https://github.com/bloomberg/chef-bcpc) which is ceph backed. When we boot an instance from volume the cinder create volume from image function ( https://github.com/openstack/cinder/blob/stable/kilo/cinder/volume/drivers/rbd.py#L850) ends up pulling the entire image through the glance API, so lots of tenants doing this creates quite a bit of load on our API nodes. We were confused why it did this, when its way more efficient to go directly via rbd clone, we created a patch and tested and it seems to work just fine (and an order of magnitude faster) https://github.com/bloomberg/chef-bcpc/pull/742 So, the question is: what are other ceph backed installations doing ? Caius -- Caius Howcroft @caiushowcroft http://www.linkedin.com/in/caius