Efficient Feature for Site Availability and Low Recovery Point Objective (RPO)

C.

The best answer to this question is C. vSphere Replication.

vSphere Replication is a feature of VMware vSphere that provides asynchronous replication of virtual machines (VMs) from one site to another. With vSphere Replication, an administrator can configure replication for individual VMs or groups of VMs, and specify the replication frequency and retention policies. The replicated VMs can be used for disaster recovery, site migration, and planned downtime.

vSphere Replication provides site availability with minimal effort and a low RPO because it replicates only the changes made to the VMs since the last replication, which reduces the replication time and bandwidth usage. Additionally, vSphere Replication allows the administrator to configure the RPO for each VM, which defines the maximum amount of data loss that can occur in case of a disaster. The RPO can be as low as 5 minutes, which means that the replicated VMs will contain no more than 5 minutes of data loss.

vSphere High Availability (HA) is another feature of VMware vSphere that provides site availability, but it requires more effort to set up and maintain. vSphere HA uses a cluster of hosts to provide automatic restart of VMs in case of a host failure, and it requires shared storage and a quorum of hosts to function properly. The RPO of vSphere HA is dependent on the frequency of VM snapshots or backups, which can be time-consuming and resource-intensive.

vSphere vMotion is a feature of VMware vSphere that provides live migration of VMs between hosts or datacenters without downtime. While vSphere vMotion can contribute to site availability, it does not provide data replication or disaster recovery capabilities.

vSphere Fault Tolerance is another feature of VMware vSphere that provides continuous availability of VMs by creating a live shadow instance of a VM on another host. While vSphere Fault Tolerance can provide high availability, it requires specific hardware configurations and has higher resource requirements than vSphere Replication. Additionally, vSphere Fault Tolerance does not provide data replication or disaster recovery capabilities.