In Storage Foundation for Windows, the statistics threshold is the minimum amount of I/O per second that a disk or subdisk must have to display an I/O status other than the Low I/O activity status.
The statistics threshold is the minimum amount of I/O per second that a disk or subdisk has to have to display a color other than blue on its status icon. Blue designates the lowest state, Low I/O activity. The default threshold is 15. You set this threshold in the Online Data Display Options window.