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Difficulty: MediumDesign Compute High Availability

A retail company is designing the compute infrastructure for a new customer loyalty portal. The portal must run on Azure Virtual Machines and requires at least two VM instances to handle traffic. The architecture must guarantee a compute SLA of 99.99%99.99\% and protect against the failure of an entire datacenter. Which VM deployment configuration meets the requirements?

  1. A
    Deploy the virtual machines within a single Availability Set.
  2. B
    Deploy the virtual machines as Azure Spot Virtual Machines across multiple Availability Zones.
  3. Deploy the virtual machines across two or more Availability Zones in the same Azure region.Answer
  4. D
    Deploy the virtual machines in a single Availability Zone using a Proximity Placement Group.

Answer

Deploy the virtual machines across two or more Availability Zones in the same Azure region.
Deploying two or more virtual machines across multiple Availability Zones guarantees a 99.99%99.99\% SLA for VM uptime and provides protection against datacenter-level failures, as each zone consists of one or more datacenters equipped with independent power, cooling, and networking.

Step-by-Step Solution

1
Analyze the SLA and high availability requirements.
The workload requires a 99.99%99.99\% SLA and resilience against datacenter outages.
Establishing these constraints narrows down the Azure deployment options to those that span physical zones.
2
Evaluate the SLA of different VM deployment options in Azure.
Availability Zones provide a 99.99%99.99\% SLA for VMs, whereas Availability Sets provide a 99.95%99.95\% SLA. Spot VMs have no SLA.
Matching the options against the 99.99%99.99\% threshold ensures compliance with the target SLA.
3
Verify datacenter-level resilience.
Availability Zones are physically separate datacenter locations within an Azure region, whereas Availability Sets and single-zone Proximity Placement Groups are contained within a single zone or datacenter.
Selecting Availability Zones ensures the system can tolerate the complete failure of a single datacenter.

Key Concept

Designing virtual machine configurations to meet specific SLA and redundancy requirements using Azure Availability Zones.
Estimated Time:1m 30s
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Topics

Design Compute High Availability

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