This is the errorDisableFiPort property of a 64-bit threshold definition object, the definition of one 64-bit-valued statistics threshold, used for larger cumulative counters such as total bytes transferred, that belongs to a threshold policy, a TruthValue controlling whether UCS Manager should administratively disable the associated fabric interconnect port if this threshold is exceeded. An admin enables this as an automated protective action so a fabric interconnect port causing a serious threshold breach, such as excessive errors, gets shut down without waiting for a human to react. For example, enabling errorDisableFiPort on a threshold covering port error counts means UCS Manager will automatically take a misbehaving uplink port offline rather than let it keep degrading traffic.