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[ceph] instance snapshot

Hello,

Im wondering about snapshotting instances using ceph rbd backend.

For example: If I have instance based on root disk I can easily snapshot it, but it actually is copy-on-write clone of a block device snapshot. Snapshots are flattened - cloned images doesn't retain a reference to the parent snapshot.

Is there any way to make openstack snapshot of VM which depends on parent image? I don't want to clone snapshot and make independent image. I just want to make quick snapshot. Nothing more.