HP Capacity Advisor 7.2 User Guide

Table 30 Define static estimates — settings to guide Estimated Utilization assumptions for workload
DescriptionAttribute or actionArea
Fractional or whole number of cores assumed to be
used by the new workload on the assigned system.
Default: 0.0
CPU Core UtilizationStatic Profile
Memory assumed to be used by the new workload.
Default: 0.0
Memory Utilization (GB)
Network bandwidth assumed to be used by the new
workload. Default: 0.0
Network I/O Utilization (Mb/s)
Disk bandwidth assumed to be used by the new
workload. Default: 0.0
Disk I/O Utilization (MB/s)
Clicking this button automatically fills in the following
values from the Assigned System selection:
• System Model – Model number for simulated system.
Default: None
• Processor Model – Processor model name. Default:
Itanium
• CPU Core Count – Total number of cores on the
simulated system. Default: 0
• CPU Speed (GHz) Typical speed of the selected
processor. Default: 0.0
These fields can also be filled in manually using values
that you choose for the workload.
Import from Assigned System
TIP:
Providing estimates for a static profile
The baseline that you enter should represent your best guess as to the load the particular application
or workload will place on the system where you assign it. For example, if you have an application
that you plan to assign to a four-core system, and it typically uses two cores, you would enter 2.0
for CPU utilization. In the same way, you would enter a processor speed based on the system the
workload originally ran on, and the amount of memory usually consumed by the workload on its
previous system.
Once you have a baseline workload that represents current behavior, you can create additional
workloads with different values to experiment with variations in the CPU speed, available memory,
and variable utilization limits to discover the behavior and performance of the workload in different
scenarios.
Adjusting for virtualization changes
Capacity Advisor gives you the ability to provide compensating factors to help Capacity Advisor
adjust needed resources when analyzing moving workloads from a physical system to a virtual
machine on a VM host or from a virtual machine to a physical system.
(For information on how utilization is calculated for each resource, see Appendix (page 211).)
CPU Virtualization Overhead %
The following section presents the scaling factor that you can use to more accurately simulate the
impact of changing a standalone system to a virtual machine, or a virtual machine into a standalone
system. In these situations, CPU utilization can increase or decrease due to the overhead required
for the virtual machine software. The CPU Virtualization Overhead % helps you to account for this
in a scenario.
Adjusting for virtualization changes 187