Hi, I use a Havana infrastructure with CEPH storage (cinder & rbd) and when i create new big volume this is very slow. Openstack provision all the space on CEPH cluster this is very very (very) slow. There is a way to improve this? I know this is possible to import glance image from existing rbd images like this : http://www.sebastien-han.fr/blog/2013/05/07/use-existing-rbd-images-and-put-it-into-glance/ Sample : glance image-create --size 104857600000 --name new_img --store rbd --disk-format raw --container-format bare --location rbd://my_volume Can i make it the same with cinder? Thanks in advance! --Tom