Adjusting power, Power cap data – HP Matrix Operating Environment Software User Manual
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•
Globally. These limits apply to every workload, wherever workloads are analyzed.
•
By Workload. These limits apply to one specific workload, wherever that workload is analyzed.
•
Scenario-wide. These limits apply to every workload within one specific scenario.
•
By Scenario Workload. These limits apply to one specific workload within one specific scenario.
When a workload falls within more than one scope, only the more specific one applies, as shown
in the table below.
You can disable a more specific scope where you do not want a specific scope to apply.
Table 3-2 Scope of utilization limits
Overrides
Description
Limits
Scope
• Nothing
• Applies to all workloads for which a more specific
utilization limit is not provided.
• Cannot be disabled
More
global
• Global
• Applies to a specific workload unless a more specific
utilization limit is provided.
• Can be enabled or disabled
• Global
• Workload
• Applies to all workloads within a scenario for which a more
specific utilization limit is not provided.
• Can be enabled or disabled
More
Local
• Global
• Workload
• Scenario
• Applies to a specific workload within a scenario.
• Can be enabled or disabled
Scenario
Workload
Utilization Limit
Adjusting power
With the cost of power increasing, power has become a resource that you may want to measure
and manage. Within HP Insight Dynamics suite, power metrics, graphs and reports are displayed
for actual systems and for systems within capacity planning scenarios.
NOTE:
You can calibrate power for physical systems (including virtual partitions), but not for
virtual machines.
To make the power data as accurate as possible, you are provided with the opportunity to calibrate
power usage using data collected from actual systems, or you can supply your own values.
Power cap data
The power cap function on some HP hardware allows you to set a limit in watts for a server, and
the server will ensure that its power consumption never exceeds that limit. That, in turn, can
reduce power and cooling costs. It can also help to ensure that a data center does not draw more
energy from the power grid than it is allocated to use, reducing the likelihood of experiencing
unplanned downtime necessary to stay within a power allocation limit.
The potential drawback to not setting the power cap high enough is degraded hardware response
time, which an administrator can rectify by adjusting the cap -- or accept in exchange for the
associated savings. For detailed information on how power caps work in HP hardware, see
.
Capacity Advisor gives you insight into the current power cap for HP systems that have these
options available and operating. Within Capacity Advisor, you can generate a power report to
see historic power usage data that includes power cap settings and estimated enforcement time.
The following image shows an example of the power cap data included in a Capacity Advisor
power report.
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Key Capacity Advisor concepts