Which tool assists in performing a non-disruptive VM migration between datastores?

Storage vMotion is the correct choice for performing a non-disruptive virtual machine (VM) migration between datastores. It allows you to move VM files from one datastore to another while the VM remains powered on and continues to run without interruption. This capability is essential for tasks such as load balancing storage resources, performing maintenance on datastores, or optimizing storage usage.

The functionality of Storage vMotion ensures that there is no downtime experienced by the users or applications accessing the VM during the migration process, which makes it a powerful tool for maintaining uptime and availability in a virtualized environment.

Other tools mentioned serve different purposes. vSphere vMotion is used for migrating running VMs from one host to another within the same datastore, but it does not facilitate datastore-to-datastore migrations. vSphere Replication is designed for disaster recovery by replicating VMs to another location, not for performing live migrations. VMware Converter, on the other hand, is primarily used for converting physical machines to virtual machines or vice versa and is not optimized for on-the-fly migrations of VMs between datastores.