The Performance Tab

The Performance section, shown in the following figure, displays the following information:

  • Report Rate
  • Compression
  • Overruns


Note: Not all reports in the Reports section are available for all collectors.

Report Rate: This display is a trend chart that displays the average rate at which data is coming into the server from the selected collector. This is a general indicator of load on the Historian collector. Since this chart displays a slow trend of compressed data, it may not always match the instantaneous value of Report Rate displayed in the Collector panel of the System Statistics page.

Compression: This display is a trend chart that displays the effectiveness of collector compression. If the chart displays a low current value, you can widen the compression deadbands to pass fewer values and increase the effect of compression.

Overruns: This trend chart displays the value at which data overruns are occurring. This value is calculated by the following equation:
OVERRUN_PCT =OVERRUNS / ( OVERRUNS + TOTAL_EVENTS_COLLECTED )
Overruns are a count of the total number of data events not collected. In normal operation and under normal conditions, the current value should always be zero. If the current value is not zero, which indicates that data is being lost, you should take steps to reduce peak load on the system by increasing the collection interval.