If you have used Vsphere 4, you will know that when configuring HA and ‘percentage of cluster resources reserved as failover spare capacity ‘ under Admission Control Policy, the percentage set is for both memory and CPU. You don’t get the option to set seperate percentages for memory and CPU. See screen shot to the left. (Click on image to enlarge)

 



With Vsphere 5, vmware have split this so you can now set seperate percentages for CPU and memory. See screen shot below: (Click on image to enlarge)