ould 

              (not must) be bigger than the check interval.<br>

              Here is an example : Check interval of 2 minutes and delta of 4min</p>

            <p class="SectionBody">T0 : value 1 : can't calculate usage<br>

              T0+2 : value 2 : can't calculate usage<br>

              T0+4 : value 3 : usage=(value3-value1)/((T0+4)-T0) <br>

              T0+6 : value 4 : usage=(value4-value2)/((T0+6)-T0+2)<br>

              (Yes I know TO+4-T0=4, it's just to explain..)<b