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 lower than 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 Maximum Power Cap threshold. The server must not exceed
this value.
For server blades, this value is the initial power-on request value.
For nonblade servers, this value is the power supply capacity.
◦ 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 lower than 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 all servers. For more information, check the server specifications.
• Power capping settings for some servers must be managed outside of the iLO web interface with tools
such as the following:
â—¦ HPE Advanced Power Manager
See the server specifications at
http://www.hpe.com/info/qs for information about the power
management features your server supports.
154 Power capping considerations
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