The new overhead calculation is Total Capacity - Configured Capacity, the description of total
in cpacity shows Total amount of memory reservation used by and available for vCenter -on virtual machines and powered services on the host. The new overhead model is basically taking the amount of memory that is left over after accounting for all the memory being consumed by virtual machines, vSphere services on the host, and VMkernel core functionality, such as device drivers and other internal uses and subtracting that from the configured capacity. vSphere
Web Client; select a host, click on vSphere , and then select the Performance tab. We are going to want to change our view to Memory and then select Chart Options. Monitor
In the Chart Options, I have unselected all the counters except Total Capacity.
In the image below, we can see that the total capacity available for powered-on virtual machines and
services vSphere on average 7480 MB. is
If I subtract this from the configured capacity of 15930 MB, I have a remaining amount of 8450 MB, which is the overhead that is being used by ESXi and the virtual machines.
If I move back to
Operations Manager, we notice that the overhead is 8.63 GB or roughly 8427 MB. vRealize
If you want to dive a little deeper into overhead, you can go back to the
Web Client or vSphere Operations Manager All Metrics, then look at vRealize which is the total amount of memory reservation used by powered-on virtual machines and reservedCapacity services on the host including overhead amount; and vSphere which is the amount of machine memory used by sysUsage for core VMkernel , such as device drivers and other internal uses, it does not fuctionaly memory used by virtual machines or incude services. vSphere