vSphere Client Management of Performance Statistics

The vSphere Client displays the Performance Manager historical interval collection levels in the vCenter management statistics display. The vSphere Client also displays an estimate of the amount of storage that is required for data collection at the displayed levels. If individual counter levels are modified through the vSphere API (the UpdateCounterLevelMapping method), the vSphere Client will show a modified estimate. However, the vSphere Client cannot detect that the method has been called and it cannot display the current levels for individual counters. If you see a significantly increased estimate for storage, be aware that someone may have used the vSphere API to modify data collection.