What does the VMware Distributed Resource Scheduler (DRS) do?

The VMware Distributed Resource Scheduler (DRS) is designed to optimize resource use within a cluster of ESXi hosts by automatically balancing workloads. It continuously monitors the resource usage of virtual machines and the available resources across the hosts in the cluster. When it identifies imbalances, such as a host being overloaded while others have spare capacity, DRS can migrate virtual machines from one host to another using VMware vMotion. This automated load balancing ensures that all virtual machines have sufficient resources to function efficiently, improves overall performance, and enhances the availability of applications running within the virtualized environment.

This capability to dynamically allocate resources as workloads change is critical for maintaining performance levels and ensuring that resource demands are met without manual intervention. While certain other options may address aspects related to virtualization, they do not encompass the core function of DRS, which is primarily focused on the automated management of resources and workload balancing.