<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def volume_attach(name, server_name, device='/dev/xvdb', **kwargs):
    '''
    Attach block volume
    '''
    conn = get_conn()
    return conn.volume_attach(
        name,
        server_name,
        device,
        timeout=300
    )