What issue can be resolved by using vSphere vMotion for migrating virtual machines?

Using vSphere vMotion allows for the live migration of virtual machines (VMs) from one physical host to another within the same cluster, without any downtime. This capability is particularly beneficial when a vSphere cluster needs to be upgraded, as it enables administrators to migrate all running VMs off of the host that is going to be upgraded. By migrating the VMs to other hosts in the cluster, the upgrade can be performed seamlessly without impacting the availability of the services that the VMs provide. This ensures that users experience no interruptions during the maintenance process.

The other options do not align with the core functionality of vMotion. For instance, vMotion does not address issues related to VM file naming mismatches, it is not used to resolve patching problems requiring a rollback, and it isn't designed to mitigate storage traffic issues either. Each of those scenarios involves different tools or approaches, making vMotion specifically valuable for scenarios where minimizing downtime during cluster upgrades is critical.