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Difficulty: MediumConfigure VMs for High Availability

Zenith Trading plans to deploy a critical line-of-business application on Azure virtual machines in the East US 2 region. The application infrastructure must survive a local datacenter-wide outage and maintain a minimum virtual machine uptime SLA of 99.99%99.99\%. Which deployment configuration should you use to meet these requirements?

  1. Deploy the virtual machines across two or more Availability Zones in the region.Answer
  2. B
    Deploy the virtual machines in a single Availability Set configured with three fault domains.
  3. C
    Deploy the virtual machines in a single Availability Set and distribute them across different Availability Zones in the region.
  4. D
    Deploy the virtual machines in a single Availability Zone using managed disks configured with Zone-Redundant Storage (ZRS).

Answer

Deploy the virtual machines across two or more Availability Zones in the region.
Deploying virtual machines across different Availability Zones ensures they are located in physically separate datacenters within the region. This isolates them from datacenter-wide failures (such as power, cooling, or structural outages) and meets the 99.99%99.99\% virtual machine uptime SLA requirement.

Step-by-Step Solution

1
Analyze the high availability requirements.
The application must survive a datacenter-wide outage and require a 99.99%99.99\% virtual machine uptime SLA.
This establishes that logical isolation within a single datacenter (which only provides a 99.95%99.95\% SLA) is insufficient.
2
Evaluate the capabilities of Azure Availability Zones.
Availability Zones consist of physically separate datacenters within an Azure region, protecting against datacenter-level failures and yielding a 99.99%99.99\% SLA when two or more VMs are deployed across zones.
This aligns perfectly with both the outage survival and SLA requirements.
3
Evaluate the capabilities of Azure Availability Sets.
Availability Sets deploy VMs across different hardware racks (fault and update domains) within a single datacenter, protecting against localized hardware failure but not datacenter-wide outages.
This rules out options utilizing Availability Sets as a solution for datacenter-wide protection.

Key Concept

Azure Availability Zones protect applications and data from datacenter failures by placing virtual machines in physically unique locations within a region, providing a 99.99%99.99\% VM uptime SLA.
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Configure VMs for High Availability

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