When booting an image from Openstack in which CEPH is the back-end for both volumes and images, I'm noticing that it takes about ~10 minutes during the "spawning" phase -- I believe Openstack is making a fully copy of the 30 GB Windows image. Shouldn't it be a "copy-on-write" image and therefore take only a few seconds to spawn? (The other reason I think it's copying the whole 30 GB is that I monitored ceph using "ceph -w" and I saw the data volume size increase.)
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