Users Guide

NOTE: The Power Conguration link is available only if the server power supply unit supports power
monitoring.
The iDRAC Settings Power Conguration page is displayed.
2 Select Enabled to enable the Power Cap Policy Else, select Disabled.
3 Use the recommended settings, or under User Dened Power Cap Policy, enter the required limits.
For more information about the options, see the iDRAC Settings Utility Online Help.
4 Click Back, click Finish, and then click Yes.
The power cap values are congured.
Conguring power supply options
You can congure the power supply options such as redundancy policy, hot spare, and power factor correction.
Hot spare is a power supply feature that congures redundant Power Supply Units (PSUs) to turn o depending on the server load. This
allows the remaining PSUs to operate at a higher load and eciency. This requires PSUs that support this feature, so that it quickly powers
ON when needed.
In a two PSU system, either PSU1 or PSU2 can be congured as the primary PSU. In a four PSU system, you must set the pair of PSUs
(1+1 or 2+2) as the primary PSU.
After Hot Spare is enabled, PSUs can become active or go to sleep based on load. If Hot Spare is enabled, asymmetric electrical current
sharing between the two PSUs is enabled. One PSU is awake and provides the majority of the current; the other PSU is in sleep mode and
provides a small amount of the current. This is often called 1 + 0 with two PSUs and hot spare enabled. If all PSU-1s are on Circuit-A and all
PSU-2s are on Circuit-B, then with hot spare enabled (default hot spare factory conguration), Circuit-B has much less load and triggers
the warnings. If hot spare is disabled, the electrical current sharing is 50-50 between the two PSUs, the Circuit-A and Circuit-B normally
has the same load.
Power factor is the ratio of real power consumed to the apparent power. When power factor correction is enabled, the server consumes a
small amount of power when the host is OFF. By default, power factor correction is enabled when the server is shipped from the factory.
Conguring power supply options using web interface
To congure the power supply options:
1 In iDRAC Web interface, go to Overview > Server > Power/Thermal > Power Conguration > Power Conguration. The Power
Conguration
page is displayed.
2 Under Power Supply Options, select the required options. For more information, see iDRAC Online Help.
3 Click Apply. The power supply options are congured.
Conguring power supply options using RACADM
To congure the power supply options, use the following objects with the set command:
• System.Power.RedundancyPolicy
• System.Power.Hotspare.Enable
• System.Power.Hotspare.PrimaryPSU
• System.Power.PFC.Enable
For more information, see the iDRAC RACADM Command Line Interface Reference Guide available at dell.com/idracmanuals.
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Monitoring and managing power