The Charts sub-tab allows you to view a trend in performance for a host. Use the Host selector to select the host of interest and the Chart selector to select the performance metrics to trend. You can also select specific time interval (Chapter 10, Selecting a time period ) over which to trend the data.
If you select a physical host, the following charts are available:
If you select a virtual machine, the following charts are available:
Sometimes one performance counter value can be much smaller than the other performance counters, making it hard to see the the smaller counter value trend. In this case, you can view the trend for only the smaller counter, by clicking on the legend item corresponding to the counter of interest. For example, when viewing the CPU Utilization chart, clicking with the mouse button on I/O wait will change the chart to display only the trend for percent of CPU time spent waiting for IO; an additional trend line for the % of CPU time spent executing user processes can be added to the chart using Shift+ mouse button on User; or clicking with the mouse button on I/O wait or the background of the legend area will cause all trend lines to be displayed again.