openstack -- does it use "copy-on-write"?

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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.)

I've configured OpenStack to use CEPH. (It's virtually identical to the documentation, except that the glance api is version 1.0 and I've not configured CEPH backup service.)
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