User Guide

4. Enable the Derate Heat, Power or Weight in an aggregate checkbox if needed. Asset Roll-up is the original
total value for the heat, power and weight.
NOTE: The warning message indicates that the derate settings for the device will be overridden by a containing asset that has an
aggregate derate setting already.
Real world power
Real world power usage provides visibility into the energy consumption of equipment, the largest consumer of
energy in a data center. It provides the capability to centrally manage large deployments of rack PDUs. The
power for the devices mounted in each rack is provided through the PDUs associated with that rack. By
retrieving the Real world power usage values for each PDU of the rack and summing these values up, then a
snapshot of the total power consumed by the devices of that rack can be provided at the time the readings were
taken.
The Real world power values of each PDU can be obtained in several ways. For supported PDUs, the application
can get readings directly communicating with the PDU via SNMP. Indirectly, Data Center Planner can be set up
for integration with other software applications to retrieve the Real world power readings from the PDUs
managed by these applications via web services. For additional information, see Integration with other Emerson
Network Power Products on page 27.
The Real world power reading of the PDUs is used to replace the value in the derate fields of the PDU. This is
available in the PDU asset view, using the properties, derate panes. Once the real world powerusage value is
retrieved, the application overwrites the derate value for each PDU automatically. Also, by summing the real
world power usage of each PDU associated with the rack, the derate value of the rack is automatically updated.
NOTE: The history of derate values is not saved.
To configure real world power for PDUs:
1. In plan view, double-click on a rack to open rack view.
2. Double-click on the desired PDU to open asset view.
3. Open the Properties, Derate pane and under External Source Setting for Real Power, select a source type as
detailed in the following table.
4. Check the Auto-Overwrite derated power checkbox and click Test. The system sends the requested
parameters to the PDU and retrieves the real world power usage. Once the PDU is enabled for access, the
value is retrieved and displayed in Real Power field under Properties, Derate.
5. If the power value is retrieved, click Save. If the test fails, check the input parameters the make sure they are
correct and make sure the destination PDU is available.
Chapter 12: Managing Panes 105