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Reported CPU Usage Values Differ in vCenter and Veeam ONE

KB ID: 1013
Product: Veeam ONE
Published: 2011-07-14
Last Modified: 2023-12-13
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Challenge

The reported maximum, minimum, and average CPU usage values do not match between the vCenter and Veeam ONE. 

Cause

How the Values Are Calculated in vSphere Client

VMware calculates these values with Hyperthreading Technology enabled.

The VMware vSphere client shows that “Hyperthreading” is in the “Active” state under the “General” section on the Summary tab for the ESX(i) host within the virtual infrastructure:

User-added image

As a result, the “Advanced” performance page for this host shows total values for all processors but with the Hyperthreading feature enabled.

Once all object are selected under the Chart Option window, the CPU Usage is displayed for all virtual CPUs and the ESX(i) host itself. Summing up the average values of each virtual CPU and then dividing by the number of virtual CPUs produces a value approximately two times smaller than the TOTAL CPU Usage value for the host.

 

How the Values Are Calculated in Veeam ONE

Veeam ONE calculates the total CPU Usage without using VMware’s “Total CPU Usage for entire host with Hyperthreading enabled” option. It takes each CPU's Usage and then performs calculations as described above. Thus, in Veeam Monitor, the Total CPU Usage value is two times smaller than CPU Usage for the entire host on VMware’s graphs.

Solution

No solution required as this is the expected behavior.

More Information

If you have any questions or problems, please contact Veeam Support.
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