Which feature of vSphere allows for automated load balancing of resources?

The Distributed Resource Scheduler (DRS) is the feature of vSphere that facilitates automated load balancing of resources in a virtualized environment. DRS continuously monitors resource utilization across the hosts in a cluster and dynamically reallocates resources among virtual machines as needed. This ensures that workloads are balanced according to the current demand and that any resource contention is minimized, which optimizes overall performance and efficiency.

DRS can automatically migrate virtual machines to different hosts using VMware's vMotion technology, depending on factors such as CPU and memory usage, which further enhances the operational efficiency of the datacenter. By doing so, it helps maintain service levels and can safeguard against potential resource bottlenecks.

Other options listed do have their purposes but do not focus on automated load balancing in the same way. VMware Mirage is primarily concerned with application and desktop management, vSphere Replication focuses on disaster recovery and backup, and Storage DRS deals specifically with managing storage resources for virtual machines. Each of these features plays a role in VMware's ecosystem, but DRS is specifically designed for the dynamic adjustment of resources across the entire cluster to enhance performance and resource utilization.