Which feature ensures a virtual machine can power up at another data center during a disaster?

The feature that ensures a virtual machine can power up at another data center during a disaster is vSphere Replication. This technology enables the replication of virtual machines from one location to another, allowing for disaster recovery scenarios. When a failure occurs at the primary site, vSphere Replication can assist in bringing those machines online at a secondary site, ensuring business continuity.

Compared to other options, vSphere High Availability primarily focuses on restarting virtual machines on the same cluster following a host failure, but it does not facilitate powering up VMs at a different location. vMotion allows for live migration of virtual machines between hosts within the same data center without downtime, which is useful for load balancing but does not apply in disaster recovery across sites. Fault Tolerance provides continuous availability of virtual machines by creating a live shadow copy; however, it does not empower virtual machines to be powered up at a different site during a disaster.

Therefore, vSphere Replication is specifically designed for disaster recovery, enabling seamless failover and access to virtual machine data stored remotely. This capability is critical in ensuring that virtual machines are available even when the primary data center is compromised.