def METHOD_NAME(self, path, run_as_root=True):
    """Verify an existing RBD handle is connected and valid."""
    try:
        self._execute('dd', 'if=' + path, 'of=/dev/null', 'bs=4096',
                      'count=1', root_helper=self._root_helper,
                      run_as_root=True)
    except putils.ProcessExecutionError:
        return False
    return True