NetApp Cloud Volumes ONTAP provides a High Availability (HA) configuration, which is crucial for ensuring that services remain available even during unplanned outages. When using NetApp Cloud Volumes ONTAP in environments such as Azure, ensuring continuous availability, especially for NFSv4 workloads, is vital.

The "High Availability" (HA) feature creates a pair of ONTAP instances configured as an active-passive cluster. This setup reduces failover times by allowing one node to take over if the other fails, providing minimal service disruption. HA is designed to manage failovers automatically, which is essential for applications requiring constant availability, such as those using NFSv4. In Azure, enabling this feature via the appropriate subscription registration ensures that when an unexpected failure occurs, the system will automatically failover to the standby node, minimizing downtime and ensuring that the application continues to function smoothly without manual intervention.

In this case, "multipath HA," "fault tolerance," and "redundancy" are related concepts, but they don’t directly address the specific need to register and enable the high-availability feature in Azure. Registering HA on the Azure subscription ensures that the Cloud Volumes ONTAP can perform its failover processes effectively, keeping the application running.