Availability set and Availability zone in Azure

Azure?Availability Set and Availability Zone, both always confuse us, even both designed to keep the application high available from single point of failure from various components or the complete zone. Again, one more major thing we should aware we can choose either one only,

Now let’s see about each separately more details about both the services.

Availability set

When you deploy the virtual machine in Azure, it can be spanned across multiple servers in the Azure back-end. But there could also be a chance where your VMs might place on the same physical server as well. Assume that you have an application that hosted on more than two VMs with a load balancer. By chance, if the VM’s are getting into the same physical rack or same physical server, it’s a single point of failure. To overcome this issue, Azure has an option called –?Availability set.

An?Availability Set?is a logical grouping capability for isolating VM resources from each other when they’re deployed. Azure ensures that the VMs you place within an?Availability Set?run across multiple physical servers, compute racks, storage units, and network switches. Each rack gets its own power supply units as well. This increases service availability from 99.9% to 99.95% when you deploy more than one VM.

Availability Set uses two key methods to keep the VM’s in the different physical computing environments. When you add the virtual machines in the same availability set, it will automatically distribute the VMs to different Update domain and fault domains to eliminate the single point of failure within the datacenter.

There are three scenarios that can lead to a virtual machine in Azure being impacted:

• planned maintenance.
• unplanned hardware maintenance.
• unexpected downtime.

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