Power Capping - Hitachi Compute Blade 2000 User Manual

You can view this information in two ways: (1) Graph display, or (2) Table display. To
view server chassis power usage data, see "Power Status Trend View (Chassis)".
For more information, see Chapter 6. To view server blade power usage data, see
"Power Status Trend View (Partition)". For more information, see Chapter 6. To view
the information in command mode, see "DL Command". For more information, see
Chapter 11.

Power capping

By using the power capping feature, processor performance can be automatically
adjusted so that the server blade's power consumption never exceeds a limit value
set by the server administrator. This allows applications to run at optimal
performance per watt*, reducing excess heat generation and lowering power
infrastructure costs.
Using the Management Module's system Web console, the server administrator can
set a limit value or "cap" on the power consumption of a selected server blade. The
set power cap must be between the minimum and maximum power consumption
values displayed on the console.
Power capping has two control modes: Static control and dynamic control.
In static control mode, appropriate ACPI processor performance states (P-states)
are set for the server blade's CPU in line with the specified power capping value so
that the server blade's maximum power consumption is kept within a set limit. In
contrast, in dynamic control mode, CPU performance is lowered only when power
consumption comes close to the power capping value, keeping the server blade's
mean power consumption within a set limit. High performance server blades support
only dynamic control.
*Indicator of performance per consumed power
 Supported OS
The Compute Blade 2000's power capping feature has been verified to work in static
control mode with the following operating systems. Dynamic control mode is
independent of the OS and works with any operating system.
 Windows Server 2008 R2
 Windows Server 2008
 Windows Server 2003
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