What technology does VMware use for load balancing among VMs?

The Distributed Resource Scheduler (DRS) is the technology that VMware employs for load balancing among virtual machines (VMs). DRS dynamically manages resource allocation in a cluster of hosts to ensure optimal performance and efficiency. It analyzes the resource usage (CPU and memory) of VMs and hosts within a cluster and makes decisions on VM placement, including balancing workloads across hosts by automatically migrating VMs as needed.

When resource demands change, DRS can initiate a VM migration using VMotion to move the VM from a heavily loaded host to one with available resources, balancing the overall workload across the cluster. This capability is essential for maintaining performance levels and is particularly important in environments with fluctuating workloads.

The other options serve different purposes. VMware Storage DRS optimizes storage resource allocation and load balancing at the data store level rather than at the VM level. VMotion is a feature that allows for the live migration of VMs between hosts but does not inherently manage load balancing. vSphere Replication focuses on data protection and disaster recovery rather than load balancing, ensuring that VMs can be restored in case of failure rather than optimizing their placement across hosts.