Important:
The chosen settings apply to this monitoring session only. The settings revert back to the default settings if you exit and re-open the Performance Monitor.If you are monitoring the storage subsystem in real time, update the statistics frequently by selecting a short polling interval; for example, 5 seconds.
If you are saving results to a file to look at later, choose a slightly longer interval, for example, 30 to 60 seconds, to decrease the system overhead and the performance impact.