What is Scale Set?

Definition: Azure lets you create and manage a group of identical, load-balanced VMs. This is called Scale Set.

• You create a baseline VM and then from that VM you can create more VMs.
• How this is helpful? When the resource demands increase, the 2^nd VM will be used. Let’s say there’s more demand in resources, then 3^rd VM will be created. Now let’s say demand decreases, then it will scale out the 3^rd VM automatically.
• You can also schedule the scaling if you know the behavior of your application.

What are the advantages of the Scale set?

• Easy to manage: It is easy to manage multiple identical VMs using a load balancer.
• High Availability: all the VMs in the scale set are identical so if 1 VM fails, the others from the scale set will keep working.
• Automatic Scaling: For increasing demand, it will scale up and for decreasing demand, it will scale down the VM automatically.
• Large Scale set: It can go up to 1000 VMs in a single scale set. This is a huge number to cover any possible scenario.
• No Extra Cost: There’s no extra cost for using a scale set. You only pay for the VMs, not the scale set.