Host Total Capacity from Resource Allocation tab

Hi all,

Starting with a VcHostSystem object, do you know how I can reach the values of "CPU total capacity" and "Memory total capacity" shown in vCenter -> Resource Allocation Tab?

I need to create resources pool and I'm reading "host.hardware.memorySize" but this is the total memory of the computer, not the size utilizable for VMs and throws the error "The available Memory resources in the parent resource pool are insufficient for the operation".

I've attached a screenshot of the values I need to read from the object.

Thanks a lot.