def METHOD_NAME(hostname, timeout=20, username=None, password=None):
    """
    Power server off
    CLI Example:
    .. code-block:: bash
        salt-run drac.poweroff example.com
    """
    client = __connect(hostname, timeout, username, password)
    if isinstance(client, paramiko.SSHClient):
        (stdin, stdout, stderr) = client.exec_command("racadm serveraction powerdown")
        if "successful" in stdout.readline():
            log.info("powerdown successful")
        else:
            log.error("powerdown racadm command failed")
            return False
    else:
        log.error("client was not of type paramiko.SSHClient")
        return False
    return True