What is the purpose of the vSphere vMotion feature?

The purpose of the vSphere vMotion feature is to migrate a running virtual machine (VM) from one ESXi host to another without any downtime. This capability is crucial for maintaining a highly available and resilient infrastructure, as it allows administrators to perform routine maintenance on hosts or balance workloads across the cluster without affecting the VM's availability.

During the vMotion process, the memory and execution state of the VM are transferred from the source host to the destination host while the VM continues to run. Consequently, users connected to the VM experience no interruption, thereby ensuring that service continuity is maintained. This is especially useful for environments requiring high availability and minimal service disruption.

The other options do not accurately describe the primary function of vMotion. For instance, conducting health checks relates to monitoring system performance and issues rather than migrating VMs. Sharing disk I/O among multiple VMs entails aspects of resource management rather than the mobility of VMs. Ensuring data redundancy is more closely associated with storage solutions rather than the dynamic motion of virtual machines across hosts.