How can you achieve high availability in Azure Virtual Desktop?

Achieving high availability in Azure Virtual Desktop is fundamentally about ensuring that users can access their virtual desktops and applications without interruption. Deploying multiple session hosts across availability zones is a robust solution for this because it distributes the workload across different physical locations. This approach minimizes the risk of downtime due to hardware failures or other issues, as users can connect to a different session host in another availability zone if one becomes unavailable.

Availability zones provide physical separation and redundancy, which enhances resilience. If one zone experiences an outage, the other zones can continue to operate, allowing users seamless access to their resources. This geographic distribution is critical for maintaining high availability, as it ensures that even in the event of a localized issue, service remains uninterrupted.

The other options would not provide the same level of reliability. For instance, using only one session host introduces a single point of failure. Limiting user connections can manage load but does not enhance availability; rather, it can restrict access during peak times. Scheduling downtime clearly contradicts the goal of maintaining availability, as it intentionally disrupts service during defined periods, leaving users unable to access their needed resources.