1. A method of maximizing server utilization within a datacenter comprising: collocating a number of workloads ( 305 ) to a subset of a number of physical servers within a datacenter; adjusting access to resources by critical and non-critical workloads ( 310 ); isolating a number of critical workloads that share resources to the subset of the number of resource instances; and controlling resource utilization of the collocated workloads.