What is the function of the vSphere Distributed Resource Scheduler (DRS)?

The vSphere Distributed Resource Scheduler (DRS) is designed to intelligently allocate and balance workloads across a cluster of ESXi hosts. Its primary function is to ensure that virtual machines (VMs) receive the necessary resources, such as CPU and memory, based on their resource requirements and the overall demands of the environment. DRS continually monitors the resource usage of VMs and hosts, dynamically adjusting resource allocations by moving VMs as needed. This helps in optimizing performance, enhancing resource utilization, and maintaining system stability.

The ability of DRS to automatically redistribute workloads ensures that no single host becomes a bottleneck while others are underutilized, leading to better overall efficiency within a virtualized environment.