How to do it...

  1. Map the block device to the client-node1:
        # rbd map --image rbd1 --name client.rbd
Notice the mapping of the images has failed due to a feature set mismatch!
  1. With Ceph Jewel the new default format for RBD images is 2 and Ceph Jewel default configuration includes the following default Ceph Block Device features:
    • layering: layering support
    • exclusive-lock: exclusive locking support
    • object-map: object map support (requires exclusive-lock)
    • deep-flatten: snapshot flatten support
    • fast-diff: fast diff calculations (requires object-map) Using the krbd (kernel rbd) client on client-node1 we will be unable to map the block device ...

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