HP Matrix Operating Environment Software - Manual (Page 107)

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 Capacity Advisor 7.0
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 HP Matrix Operating Environment:
You can click a utilization meter to view a more detailed historical data report provided
by HP Capacity Advisor. ◦
◦ You can use the VM Manager View
→Capacity Advisor Data... menu item to view a
snapshot of recent utilization data collected by HP Capacity Advisor. First, you must
enable collection of data by using the Tools
→Collect Capacity Advisor Data menu item,
as described in “Enabling collection of utilization data” (page 105) . (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 62 (page 108) shows the upper half of the screen showing data collected for a VM
Host, while Figure 63 (page 109) shows the lower half of the screen.
Viewing utilization data 107