Cloud Volumes ONTAP HA for AWS provides fault tolerance of NAS workloads by using which capability?

The capability that provides fault tolerance for NAS workloads in Cloud Volumes ONTAP HA for AWS is Asymmetric Logical Unit Access (ALUA). This feature is essential in storage area networks as it enables hosts to differentiate paths to storage devices based on the operational state of those paths.

In the context of Cloud Volumes ONTAP, ALUA ensures that paths to storage are optimally utilized while also providing redundancy. When one path becomes unavailable or experiences an issue, ALUA allows the system to redirect I/O requests to an alternate path without impacting the availability of the NAS workloads. This capability is crucial for maintaining high availability and ensuring that workloads can continue to operate seamlessly, even in the event of a component failure.

The other capabilities mentioned, while relevant in certain contexts, do not directly provide the same level of fault tolerance specifically geared toward NAS workloads in the way that ALUA does. This makes ALUA the correct answer for maintaining fault tolerance in such environments.