def METHOD_NAME(test, params, env):
    """
    Backup VM disk test when VM reboot
    1) start VM with data disk
    2) create target snapshot chains with qmp command
    3) do snapshot to snapshot nodes
    4) dd on top snapshot node
    5) shutdown VM
    6) boot VM with top snapshot node
    :param test: test object
    :param params: Dictionary with the test parameters
    :param env: Dictionary with test environment.
    """
    snapshot_chains_test = BlockdevSnapshotChainsTest(test, params, env)
    snapshot_chains_test.run_test()