Installation Manual

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.
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 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 servers with an installed Flex Slot Battery Backup Unit.
• Power capping is not supported on Synergy compute modules.
• You cannot use the iLO web interface to configure group power capping settings for SL
servers and some XL servers. Use one of the following tools to configure the power capping
settings for these servers:
◦ HPE ProLiant Power Interface Control Utility
◦ HPE Advanced Power Manager
To verify the power management features your XL server supports, see the server Quickspecs
at http://www.hpe.com/info/qs/.
208 Using iLO Federation