Azure Virtual Machines – Consider Upgrading Basic A Series Machines to Av2

Azure’s Basic A series virtual machines are approaching end-of-life, presenting an opportunity for infrastructure optimization. By upgrading to Av2 series machines, organizations can improve performance, reduce costs, and future-proof their cloud infrastructure.

Why This Policy Matters

• Performance Improvements: Leveraging newer Intel Xeon processors

• Cost Optimization: Potential for better price-to-performance ratios

• Technical Debt Reduction: Modernizing infrastructure proactively

Cost Reduction Potential

Upgrading from Basic A to Av2 series can yield significant benefits:

Example Comparison:

A3 instance (Basic): $175/month

A4 v2 instance: $139/month

Cost Savings: Approximately 20% reduction

Performance Enhancements

Av2 series machines offer:

Newer Intel Xeon processors

Improved computational efficiency

Better memory configurations

Enhanced network performance

Implementation Guide

Infrastructure as Code Example (Terraform)

Before (Basic A Series)

resource "azurerm_virtual_machine" "example" {
  vm_size = "Basic_A3"
  # Other configuration
}

resource "azurerm_virtual_machine" "example" {
  vm_size = "Basic_A3"
  # Other configuration
}

resource "azurerm_virtual_machine" "example" {
  vm_size = "Basic_A3"
  # Other configuration
}

After (Av2 Series)

resource "azurerm_virtual_machine" "example" {
  vm_size = "Standard_A4_v2"
  # Other configuration
}

resource "azurerm_virtual_machine" "example" {
  vm_size = "Standard_A4_v2"
  # Other configuration
}

resource "azurerm_virtual_machine" "example" {
  vm_size = "Standard_A4_v2"
  # Other configuration
}

Manual Migration Steps

Assessment

Inventory current Basic A series machines

Document current configurations

Verify application compatibility

Planning

Select equivalent Av2 series machine

Prepare migration strategy

Schedule maintenance window

Migration

Create new Av2 instances

Migrate data and configurations

Validate functionality

Decommission old instances

Best Practices

• Gradual Migration: Upgrade in phases

• Performance Testing: Validate workload performance

• Cost Monitoring: Track actual vs. projected savings

• Backup: Ensure comprehensive backups before migration

Recommended Tools

• Infracost: Automatically detect and estimate cost implications of VM upgrades

• Azure Advisor: Provides migration recommendations

• Azure Cost Management: Track cost optimization opportunities

Example Scenarios

Web Application Hosting

• Scenario: Small to medium web application

• Current Setup: Basic A3 instance

Upgrade Impact:

20% cost reduction

15% performance improvement

Future-proofed infrastructure

Development Environment

Scenario: Continuous integration/deployment infrastructure

Benefits:

Faster build times

Lower operational costs

Improved developer productivity

Considerations and Caveats

Potential Challenges

• Application Compatibility: Verify software support

• Migration Complexity: Potential downtime during transition

• Performance Variations: Benchmark before full migration

When to Proceed Cautiously

• Legacy Applications: Require thorough compatibility testing

• High-Sensitivity Workloads: Incremental migration recommended

• Unique Configurations: May need custom migration strategies

Frequently Asked Questions (FAQs)

Are there any risks in upgrading from Basic A to Av2 series?
Minimal risks if proper planning and testing are conducted. Always validate application performance and compatibility.

How long does a typical migration take?
Depending on complexity, migrations can range from a few hours to several days. Smaller environments typically require 2-4 hours.

Will I need to modify my existing configurations?
Minor configuration adjustments might be necessary. Terraform and infrastructure-as-code tools can streamline this process.

Can Infracost help me identify upgrade opportunities?
Yes, Infracost can scan your infrastructure and highlight potential cost optimization opportunities, including VM series upgrades.

What if my specific machine size isn’t directly comparable?
Azure provides a comprehensive size mapping. Consult Azure documentation or use Azure Advisor for precise recommendations.