IntervalEfficiency
A percentage value that represents the efficiency performance measurement in a previous 15 minute measurement interval. In the case where the agent has no valid data available for a particular interval the corresponding object instance is not available and upon a retrieval request a corresponding error message shall be returned to indicate that this instance does not exist (for example, a noSuchObject error for SNMPv1 and a noSuchInstance for SNMPv2 GET operation). In a system supporting a history of n intervals with IntervalEfficiency(1) and IntervalEfficiency(n) the most and least recent intervals respectively, the following procedure is used to update the intervals at end of a 15 minute inter- val: - discard the value of IntervalEfficiency(n) - the value of IntervalEfficiency(i) becomes that of IntervalEfficiency(i-1) for n >= i > 1 - the value of IntervalEfficiency(1) becomes that of currente 15-minute %efficiency.