Installation Manual

Configuring power caps
Prerequisites
• Configure iLO Settings privilege
• An iLO license that supports this feature is installed. For more information, see the following
website: http://www.hpe.com/info/ilo/licensing.
• The server model supports power capping.
See the server specifications for support information.
Configuring a power cap
1. Navigate to the Power Management→Power Settings page.
2. Select the Enable power capping check box.
3. Enter the Power Cap Value in watts, BTU/hr, or as a percentage.
The percentage is the difference between the maximum and minimum power values.
The power cap value cannot be set below the server minimum power value.
4. Optional: When values are displayed in watts, click Show values in BTU/hr to change the
display to BTU/hr. When values are displayed in BTU/hr, click Show values in Watts to
change the display to watts.
5. Click Apply.
iLO notifies you that the change was successful.
Power capping considerations
• During POST, the ROM runs two power tests that determine the peak and minimum observed
power values.
Consider the values in the Power Capping Settings table when determining your power
capping configuration.
◦ Maximum Available Power—The power supply capacity for a nonblade server, or the
initial power-on request value for a server blade. This value is the Maximum Power
Cap threshold. The server must not exceed this value.
◦ Peak Observed Power—The maximum observed power for the server. This value is
the Minimum High-Performance Cap threshold, and it represents the maximum power
that the server uses in the current configuration. A power cap set to this value does not
affect server performance.
◦ Minimum Observed Power—The minimum observed power for the server. This value
is the Minimum Power Cap threshold, and it represents the minimum power that the
server uses. A power cap set to this value reduces the server power usage to the
minimum, which results in server performance degradation.
• When a power cap is set, the average power reading of the server must be at or below the
power cap value.
• Power capping settings are disabled when the server is part of an Enclosure Dynamic Power
Cap. These values are set and modified by using Onboard Administrator or Insight Control
Power Management.
• Power capping is not supported on servers with an installed Flex Slot Battery Backup Unit.
Power settings 253