Amount of physical memory present on machine as provided by Hypervisor. It is computed from the sum of vmwMemCOS plus unreserved property as reported VIM subsystem. Unreserved is computed from hypervisor's total number of memory pages. VIM Parent Container: https://esx.example.com/mob/?moid=memorySystem VIM property: unreserved MOB: https://esx.example.com/mob/?moid=memoryManagerSystem&doPath=consoleReservationInfo For reference here two other related VIM properties: VIM property: memorySize MOB: https://esx.example.com/mob/?moid=ha%2dhost&doPath=summary%2ehardware VIM property: totalMemory MOB: https://esx.example.com/mob/?moid=ha%2dcompute%2dres&doPath=summary