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Thanks for the answers.

@Bernd - I use ceph as backend for block, ephemeral and image storage and You were right, glance images aren't copy-on-write, sorry for my bad.

@eblock I'm talking about nova snapshots. As You said they are flattened. But I want to create COW-clone of openstack instance(will be excellent if I could do this from horizon).

I hope You can understand me now. Is there any way to do this?