Hi. https://blueprints.launchpad.net/nova/+spec/nova-image-cache-management This change has been in code review for a while (https://review.openstack.org/#change,2902). It didn't make it in before the feature freeze because I got called away and didn't have a chance to address the last few review comments. The change stops the unbounded growth of libvirt image caches on compute nodes, which operators currently have to manually clean up "out of band". Thanks, Mikal