AZ-900 Certification Notes

Chapter 4.2 - Scale Sets

Definition

A group of identical, load balanced VMs.

Benefits

• Multiple VMs
  • Simple to manage multiple identical VMs using a load balancer
• High Availability
  • If one VM fails or stops, the others in the scale set will keep working
• Auto Scaling
  • Automatically match demand by adding or removing VMs from the scale set
• Large Scale
  • Run up to 1000 VMs in a single scale set
• No Extra Cost
  • No added cost for using scale sets

Exam Tips

Scale sets are taking virtual machines to the next level. And keeping your sanity.

• Scale sets are identical VMs. They can be activated or deactivated as needed
• A baseline VM for the scale set ensures application stability. A baseline VM is what you copy to make up the scale set VMs
• As resource usage increases, more VMs are activated to take the load
• You only pay for the VM, storage, and networking resources you use. Nothing additional for scale sets