What is an Azure Availability Set?

Amanda

I would like to understand what an Azure Availability Set is and how it helps improve the reliability and availability of virtual machines in cloud environments. How does it protect applications from hardware failures, maintenance events, or unexpected downtime? Additionally, what are the roles of fault domains and update domains within an Availability Set, and how do they contribute to ensuring high availability and better fault tolerance for applications?

Emily

An Azure Availability Set in Microsoft Azure helps improve the reliability and availability of virtual machines by spreading them across different fault domains and update domains. Fault domains protect against hardware failures by placing VMs on separate physical hardware, while update domains ensure that not all VMs are restarted at the same time during maintenance. This setup reduces the risk of downtime and keeps applications running even if one part of the infrastructure fails, making systems more stable and fault-tolerant in cloud environments.