In Data Center Expert (DCE) devices, e.g. Rack PDUs, must provide measured values through power sensors in Watts. In IT Advisor(ITA), all power measurements are assumed to be in Watts. ITA includes measured power values from any device, supporting real power measurements in Watts, regardless of make and model (including 3rd party devices).
The power sensor value is assumed to be real power, as opposed to apparent power VA, but the actual value is defined by the individual device and how DCE retrieves the value. This could be done as a calculation in the DDF.
In System Setup>External systems configuration>Update power information every ITA retrieves the peak power values from DCE at the specified power information retrieval interval. The default value is 300 seconds and average values once each day.
In System Setup>External systems configuration>Calculate power data based on the last, the peak and average power values are calculated for the time period specified. The default value is 30 days. The peak power value is the highest value ITA receives from DCE in the specified time period.
The collected data is summarized on a daily base. The summarization in done once a day at a time specified by when the server has been booted. The summarization time can be seen in the server log file using the server configuration interface. Look for entries like: Computing performance figures...
The retrieval of data between DCE and the device (rack PDU) is configured in DCE.