Understanding Azure Virtual Machine Availability Sets

Azure Virtual Machine Availability Sets are a free feature of the Azure Virtual Machines (VMs) service. They help ensure that an application running on a set of VMs remains available, despite power failures, network failures, and host OS updates. However, availability sets do not protect against data center-wide failures, they do not implement any kind of failover or coordination of application state among the VMs, and additional VMs are required to maximize guaranteed uptime, which increases the operational cost of an application.

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