Installation Manual

The Thermal Shutdown option in the system RBSU or UEFI System Utilities allows you to disable
the automatic shutdown feature. This configuration allows the disabling of automatic shutdown
except in the most extreme conditions when physical damage might result.
Power efficiency
iLO enables you to improve power usage by using High Efficiency Mode. HEM improves the
power efficiency of the system by placing the secondary power supplies in step-down mode.
When the secondary supplies are in step-down mode, the primary supplies provide all DC power
to the system. The power supplies are more efficient because there are more DC output watts
for each watt of AC input.
NOTE: HEM is available on nonblade servers only.
When the system draws more than 70% of the maximum power output of the primary supplies,
the secondary supplies return to normal operation (exit step-down mode). When power use drops
below 60% capacity of the primary supplies, the secondary supplies return to step-down mode.
HEM enables you to achieve power consumption equal to the maximum power output of the
primary and secondary power supplies, while maintaining improved efficiency at lower
power-usage levels.
HEM does not affect power redundancy. If the primary supplies fail, the secondary supplies
immediately begin supplying DC power to the system, preventing any downtime.
Use the system RBSU or UEFI System Utilities to configure HEM. You cannot configure these
settings through iLO. For more information, see the system RBSU user guide or the UEFI System
Utilities user guide.
The configured HEM settings are displayed on the System Information→Server Power page.
Power-on protection
iLO 2.50 and later provides power-on protection for Synergy compute modules by preventing
the server hardware from being powered on when the hardware cannot be identified. This situation
might occur when a mezzanine card is installed incorrectly, or a server cannot communicate with
a hardware component.
Power-on protection works in conjunction with the Auto Power-On and Virtual Power Button
Momentary Press features. If the server hardware cannot be identified when server power is
restored or a Momentary Press is requested, the server will not power on.
When the power-on protection feature prevents server power-on:
• An event is recorded in the IML.
• The server health status is set to Critical.
• If HPE OneView manages the server, an SNMP trap is sent to HPE OneView.
Power allocation (blade servers)
Blade servers operate in a shared power environment with an enclosure or frame. Before a server
can be powered on, it must obtain a power allocation from its enclosure (ProLiant servers) or
frame (Synergy compute modules).
If power-on is prevented, an error is recorded in the IML, and the server Health LED changes.
The following errors might prevent power-on:
• Electronic Keying or I/O Configuration Error—There is a mismatch between the mezzanine
devices in the server and the switches on the back of the enclosure.
• Not Enough Power—There is insufficient power available in the enclosure to power on the
server.
246 Using the power management features