Memory status show how much of the buffer amount specified for the virtual machine is available to the virtual machine at this time. Status is reported as one of the following:-
OK - indicated that there is enough physical memory available to give the virtual machine the full amount of memory buffer.
Low - indicated that the current amount of memory assigned to the virtual machine as a buffer is lower than amount that Hyper V determines should be available as a buffer.
Warning - This indicated that there is not enough physical memory available to assign any memory buffer to the virtual machine.