The system suppresses mount verification start and end messages
    for fibre channel disk devices if mount verification completes
    on the first attempt and if mount verification does not occur
    too often. MVSUPMSG_INTVL and this parameter establish this limit.

    The system issues a mount verification message after a sequence
    of MVSUPMSG_NUM mount verifications have gone unannounced on a
    specific fibre channel disk device within a span of MVSUPMSG_
    INTVL seconds.

    If this parameter is zero, all mount verification messages are
    announced.

    MVSUPMSG_NUM is a DYNAMIC parameter.