def get_ost_use(lustre_list):
    """Return the uuid and use of most used OST."""
    ost_id = ""
    ost_max = 0

    for ll in lustre_list:
        ost_id = ll.strip().split()[0]
        ost_use = int(ll.strip().split()[4][:-1])
        if ost_use >= ost_max:
            ost_max = ost_use
            ost_id = ll.strip().split()[0]
    return(ost_id, ost_max)