HP Capacity Advisor 7.2 User Guide

Table 4 Scope of utilization limits
OverridesDescriptionLimitsScope
• Nothing• Applies to all workloads for which a more specific utilization
limit is not provided.
• Cannot be disabled
Global Utilization
Limit
More
global
• Global• Applies to a specific workload unless a more specific
utilization limit is provided.
• Can be enabled or disabled
Workload
Utilization Limit
• Global
• Workload
• Applies to all workloads within a scenario for which a more
specific utilization limit is not provided.
• Can be enabled or disabled
Scenario
Utilization Limit
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 Matrix OE, 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.
When you are calibrating power data settings, you specify the following:
• How power metrics should be displayed for graphs, meters, and reports
• How the power estimation should be calibrated:
Manually (you specify idle/maximum watt usage)◦
◦ Automatically (using power and CPU data obtained from Insight Control power
management and HP iLO
◦ None (no power metrics are displayed)
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 the
HP Insight Control Power Management User Guide.
Adjusting power 31