Supportability of adding Azure VMs to an existing availability set

You may occasionally encounter limitations when you add new virtual machines (VMs) to an existing availability set. Now, you can use the following REST API service to find what VM sizes are supported in your availability set. Select Try it, and then sign in with your Azure account to run the REST API.

Availability Sets - List Available Sizes - REST API

Reference

The following chart shows some common VM series you can mix in the same availability set.

Series & Availability Set Second VM A Av2 D Dv2 Dv3
First VM
A OK OK OK OK OK
Av2 OK OK OK OK OK
D OK OK OK OK OK
Dv2 OK OK OK OK OK
Dv3 OK OK OK OK OK

All other series could not be in the same availability set because they require a specific hardware.

A8/A9 VM size can't be mixed due to requirement on dedicated RDMA backend network.

Contact us for help

If you have questions or need help, create a support request, or ask Azure community support. You can also submit product feedback to Azure feedback community.