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cap. More power is allocated to busy servers and less power is allocated to servers that are
idle.
• The power caps that you set for a group operate concurrently with the power caps that you
can set on the Power Settings page for an individual server.
• If a power cap configured at the enclosure or individual server level or by another iLO
Federation group affects a server, other group power caps might allocate less power to that
server.
• When a power cap is set, the average power reading of the grouped servers must be at or
below the power cap value.
• During POST, the ROM runs two power tests that determine the peak and minimum
observed power values.
Consider the values in the Automatic Group Power Capping Settings table when
determining your power capping configuration.
◦ Maximum Available Power—The total power supply capacity for all servers in a group.
This value is the Maximum Power Cap threshold. The servers in a group must not
exceed this value.
◦ Peak Observed Power—The maximum observed power for all servers in a group. This
value is the Minimum High-Performance Cap threshold, and it represents the
maximum power that the servers in a group use in their current configuration. A power
cap set to this value does not affect server performance.
◦ Minimum Observed Power—The minimum observed power for all servers in a group.
This value is the Minimum Power Cap threshold, and it represents the minimum power
that the servers in a group use. A power cap set to this value reduces the server power
usage to the minimum, which results in server performance degradation.
• Power capping is not supported on all servers. For more information, check the server user's
guide.
Viewing group power capping information
Prerequisites
An iLO license that supports this feature is installed.
Procedure
1. Click iLO Federation in the navigation tree, and then click the Group Power Settings tab.
2. Select a group from the Selected Group menu.
3. 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.
Power capping details
• Automatic Group Power Capping Settings—This section shows the following details:
◦ Measured Power Values—The maximum available power, peak observed power, and
minimum observed power.
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