VMware vCenter Server 7.0 brings significant improvements over previous vCenter server versions with respect to vSphere Distributed Resource Scheduler (DRS). DRS has been upgraded to adapt to a workload-centric resource management model. This is to make VMware’s compute control plane robust and better handle both traditional and modern application needs.
The main goal of the new DRS algorithm is to improve resource availability for VMs. One way to measure what DRS has achieved is by looking at the VM DRS score. The VM DRS score is a measure of the resources available for consumption by the VM. To improve this score, the algorithm now works at the VM level (ensuring better resource availability to all VMs) instead of at the cluster level (balancing load across the hosts).
To provide more information about the new DRS algorithm, we published a new white paper. In this paper, with the help of various case studies, we highlight the improvements and new features in resource management with the new DRS algorithm. The paper also provides knowledge about the factors that now affect DRS behaviour. With this information, you can understand the changes seen in resource management in vSphere 7.0.
Read the white paper: Load Balancing Performance of DRS in vSphere 7.0.