Installation Manual

The bar graph displays the average values in blue and the peak values in red. The graph
shows No cap set during a host power reset.
• 20-Minute History Graph—Displays the power usage of the server over the previous 20
minutes. The iLO firmware collects power usage information from the server every 10
seconds. The bar graph displays the average values in blue and the peak values in red.
Power metering is not supported on servers with an installed Flex Slot Battery Backup Unit.
TIP: To view the power usage for a specific point in time, move the mouse cursor over the
graph.
Power meter graph display options
When you view the power-meter graphs, use the Display Options to control the displayed
information. You can view minimum, average, peak, and cap power information.
Select one or more of the following check boxes, and then click Refresh Page to update the
graphs.
• Min (static low)—The minimum value observed during a measurement period. Typically,
the 20-minute graph measures a minimum value every 10 seconds, which matches the
average value. The 24-hour graph can capture minimum values lower than the 5-minute
average value.
• Avg—The mean power reading during the sample.
• Peak—The highest instantaneous power reading during the sample. iLO records this value
on a subsecond basis.
• Cap—The configured power cap during the sample. If the power cap is not configured or is
not supported, the Cap option is not available.
◦ A power cap limits average power draw for extended periods of time.
◦ Power caps are not maintained during server reboots, resulting in temporary spikes
during boot.
◦ Power caps set for less than 50% of the difference between maximum power and idle
power might become unreachable because of changes in the server. Hewlett Packard
Enterprise does not recommend configuring power caps for less than 20%. Configuring
a power cap that is too low for the system configuration might affect system performance.
The following options are also available:
• Power Unit—Select a value from the Power Unit list to change the power reading display
to watts or BTU/hr.
• Refresh Page—Click the Refresh Page button to update the history graphs.
Viewing the current power state
1. Navigate to the Power Management→Power Meter page.
250 Using the power management features