Defined vs Physical Memory Guaranteed

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Would someone be able to explain the difference between "Defined" and "Physical Memory Guaranteed" as displayed on the General tab for a VM under RHEV-M ?




"Defined" is how much RAM the VM can get at the very most, "guarranteed" is the minimum amount of RAM the VM will definitely have reserved for it on a host. If a host doesn't have that much RAM free, it will not be able to start that VM. 

Genius!  Thanks Dan