VMware vSphere

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  • 1.  Hypervisor CPU Overhead

    Posted Jun 20, 2017 09:02 PM

    How much CPU resources are reserved for the ESXi hosts? I have a cluster that shows total CPU resources is 672 GHz in the Summary tab, but when I go to the Resource Allocation tab, the total capacity is only 624 GHz. I am basically losing 2 whole cores per ESXi host in the cluster. Memory on the other hand is nearly identical.



  • 2.  RE: Hypervisor CPU Overhead

    Posted Jun 21, 2017 07:53 AM

    Check the System resource allocation of esxi hosts, this will give you sum of total and available resources on host.



  • 3.  RE: Hypervisor CPU Overhead

    Posted Jun 21, 2017 11:11 AM

    There is only 200 MHz reserved in the System Resource Reservation, but I am losing 4 GHz per ESXi host.



  • 4.  RE: Hypervisor CPU Overhead

    Posted Jun 21, 2017 09:02 AM

    its an expected behavior. Please find the details in following KB.

    The ESXi Summary tab and Resource Allocation tab do not show the same values for memory and CPU (2089984) | VMware KB

    the different is because an esxi host is treated as a resource pool when you see at cluster level.



  • 5.  RE: Hypervisor CPU Overhead

    Posted Jun 21, 2017 11:14 AM

    I understand that it is expected behavior, but that seems like a lot of resources given up.