HP Integrity Virtual Machines Manager 4.1 Software: User Guide

NOTE: Data reported by certain VM Manager CPU utilization meters might vary from the
data collected by Capacity Advisor as displayed in the Profile Viewer and historical utilization
reports. The data from VM Manager meters is reliable for most purposes. For capacity
planning, refer to the data collected by the Capacity Advisor Profile Viewer and historical
utilization reports. For more information about how Capacity Advisor data might vary from
VM Manager data, see “Data Handling for Virtual Machines” in Chapter 3 of the HP Insight
Capacity Advisor 6.0 Software: User Guide.
Another source of discrepancy is the difference in the way Capacity Advisor and VM Manager
present CPU data. Capacity Advisor Profile Viewer and historical utilization reports present
CPU data in absolute terms (specifying the number of physical cores used) while VM Manager
presents CPU data in terms of percentages (specifying the percentage of available CPU
resources being used). For example, the VM Manager “VM Host CPU Utilization” meter
displayed on the VM Host Virtual Machines and VM Properties General tabs displays the
percentage of the total VM Host physical CPU capacity used by the virtual machine in
question. Capacity Advisor tabulates similar data but presents it in different terms. For
example, on a VM Host that has 16 physical cores, if a VM has 4 vCPUs each currently using
50% of a physical core, CapAd would report that the VM is consuming 2 VM Host cores.
The VM Manager “VM Host CPU utilization” meter would report that the VM is consuming
12.5% of the VM Host's CPU capacity.
• Using VM Manager with Insight Dynamics:
— You can click a utilization meter to view a more detailed historical data report provided
by HP Insight Capacity Advisor software.
— You can use the VM Manager View→Capacity Advisor Data... menu item to view a
snapshot of recent utilization data collected by HP Insight Capacity Advisor software.
First, you must enable collection of data by using the Tools→Collect Capacity Ad visor
Data menu item, as described in “Enabling collection of utilization data” (page 111). (If
you use the VM Manager View→Capacity Advisor Data... menu item without having
enabled data collection, no data is displayed; however, the screen includes a link to the
Collect Capacity Advisor Data facility so that you can begin collecting data to view.)
Figure 7-2 (page 115) shows the upper half of the screen showing data collected for a
VM Host, while Figure 7-3 (page 116) shows the lower half of the screen.
114 Collecting and viewing utilization data