AZ-104 Certification Notes

Chapter 9.5 - Configuring Virtual Machine Availability and Scale Sets (Part 2)

Why Use Scale Sets?

• Purpose of Virtual Machine Scale Sets
  • Simplify scaling configurations
  • Save costs by aligning usage with demand
  • Scale to meet demand of traffic

Virtual Machine Scale Set Components

• Scale Set Components
  • VM Definition
    • Define VM size, OS, NICs, storage, etc.
  • Autoscaling Definition
    • Define scaling actions, scaling in/out based on condition met (e.g. If CPU utilization > 80% then +1 VM)
  • Scale-In Policy
    • Delete VMs by priority as scaling-in-operations occur

Exam Tips

• High Availability
  • Design highly available solutions using zonal redundant deployments
• Availability Sets
  • Provide protection for redundant VMs by preventing outages related to faults and updates by logically grouping them into domains
• Scale Sets
  • Auto scale solutions to meet demands of traffic and scale in to decrease costs when demand goes down