TIMVCFAIL specifies the time required for an adapter or virtual
    circuit failure to be detected. VSI recommends that the default
    value be used. VSI also recommends that this value be lowered only
    in OpenVMS Cluster of three CPUs or less, that the same value
    be used on each computer in the cluster, and that dedicated LAN
    segments be used for cluster I/O.

    TIMVCFAIL is a DYNAMIC parameter.