Graceful shutdown
The ability of the iLO processor to perform a graceful shutdown requires cooperation from the operating
system. To perform a graceful shutdown, the iLO health driver must be loaded. iLO communicates with
the health driver and uses the appropriate operating system method of shutting down the system safely to
ensure that data integrity is preserved.
If the health driver is not loaded, the iLO processor attempts to use the operating system to perform a
graceful shutdown through the power button. iLO emulates a physical power-button press (iLO
momentary press) to prompt the operating system to shut down gracefully. The behavior of the operating
system depends on its configuration and settings for a power-button press.
The Thermal Shutdown option in the 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.
More information
iLO driver support on page 28
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.
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 UEFI System Utilities to configure HEM. You cannot configure these settings through iLO. For
more information, see the UEFI System Utilities user guide.
The configured HEM settings are displayed on the
Power Information
page.
Power-on protection
iLO 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.
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Graceful shutdown
