HP Insight Control Software for Linux - Manual (Page 12)

phaseWatts = phaseVoltage * phaseAmps
TotalCapacity = 3 * phaseWatts
For 1-phase:
TotalCapacity = lineCurrent * lineVoltage
Converting Watts to Amperes
If you know the Watts value (watts), Voltage value (volts), and type of phase for the device, the watts can
be converted to amperes using the following formulas:
For 3-phase Wye or Delta:
amps = (watts / volts) / sqrt(3)
For 1-phase:
amps = watts / volts
Converting Amperes to Watts
If you know the Amperes value (amps), Voltage value (volts), and type of phase for the device, the amperes
can be converted to watts using the following formulas:
For 3-phase Wye or Delta:
watts = amps * volts * sqrt(3)
For 1-phase:
watts = amps * volts
Data Center Power Control
HP Insight Control power management provides you the Data Center Power Control facility to control power
and cooling for the systems in the data centers. Usually, data centers have the required power and cooling
capacity for the supported systems they contain. When the power and cooling capacity is interrupted or
reduced, the consumption must be adjusted to match the change. Some examples of sudden capacity
reduction include loss of external power, chiller failures, and utility company demands for cutbacks.
The Data Center Power Control facility provides a means to pre-define the responses to such events, creating
flexible rules in Systems Insight Manager that can be invoked when such events occur. The rules can determine
the set of systems that need to be adjusted based on criteria evaluated when the event occurs. The rules also
specify actions that should be taken on those systems. These rules allow for flexible event responses such as
"shut down all of the low-priority systems in the data center and make the medium-priority systems operate
in low power mode."
Some of the other scenarios are:
•
Data center monitoring detects that an external power source has failed, or is about to fail. The data
center continues to operate on a backup power source, but load must be reduced to make the best use
of the limited capacity of the UPS.
•
Data center monitoring detects that a chiller has failed, or is about to fail. The data center continues to
operate, but load must be reduced so the data center stays cool (and the critical workloads stay up)
as long as possible.
•
Data center management is asked by the local utility company to reduce data center power usage by
some proportion.
•
A failure in a primary data center triggers the need to bring up a standby data center.
The Data Center Power Control facility can be used to handle all of these scenarios and many others.
The Data Center Power Control facility has two pages. The Data Center Power Control Rules page is
used to define rules and the Data Center Power Control page is used to invoke the rules.
12 Key concepts