Ceph: Designing and Implementing Scalable Storage Systems

How to do it...

To demonstrate RBD cloning, we will intentionally create an RBD image (specifying the layering feature) then create and protect its snapshot, and finally, create COW clones out of it:

1. Create an RBD image with layering feature specified and check it's details:

        # rbd create rbd2 --size 10240           --image-feature layering --name client.rbd        # rbd info --image rbd2 --name client.rbd

2. Create a snapshot of this RBD image:

        # rbd snap create rbd/rbd2@snapshot_for_cloning           --name client.rbd

3. To create a COW clone, protect the snapshot. This is an important step, we should protect the snapshot because if the snapshot gets deleted, all ...