Table of Contents
Advertisement
Changes you make on this page affect all systems in the selected group.
3. Select the Enable power capping check box.
4. 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.
5. 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.
6. Click Apply.
Group power capping considerations
The Group Power Settings feature enables you to set dynamic power caps for multiple servers from a
system running the iLO web interface.
•
When a group power cap is set, the grouped servers share power to stay below the power 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 HPE 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.
Group power capping considerations
101
Advertisement
Table of Contents
Troubleshooting
