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Difficulty: MediumDesign Compute High Availability

A healthcare provider is designing the compute topology for a critical telehealth video orchestration application on Azure. The workload will run on 44 Azure Virtual Machines (VMs) that perform real-time transcoding and routing. The application has the following design requirements:

- The VMs must achieve an SLA of 99.99%99.99\% for virtual machine uptime.
- Network latency between the VMs must be minimized to ensure sub-millisecond synchronization of media feeds.
- The design must protect against localized datacenter failures.

Which two actions should you include in the design to meet the requirements? (Select two.)

  1. Deploy the virtual machines across multiple Availability Zones in the target Azure region.Answer
  2. Group the virtual machines within a Proximity Placement Group.Answer
  3. C
    Deploy the virtual machines in a single Availability Zone using an Availability Set.
  4. D
    Configure the virtual machines to use Azure Spot Virtual Machines.

Answer

Deploy the virtual machines across multiple Availability Zones in the target Azure region and group the virtual machines within a Proximity Placement Group.
Deploying the virtual machines across multiple Availability Zones is required to achieve a 99.99%99.99\% uptime SLA and protect against localized datacenter failures. To minimize network latency between these virtual machines, they should be grouped within a Proximity Placement Group to ensure physical proximity.

Step-by-Step Solution

1
Determine the configuration required to meet the 99.99%99.99\% uptime SLA.
Identify that Azure virtual machines must be deployed across multiple Availability Zones in the same region to achieve a 99.99%99.99\% uptime SLA.
Azure SLA guarantees 99.99%99.99\% virtual machine connectivity only when two or more instances are deployed across two or more Availability Zones in the same region.
2
Determine the configuration required to meet the low-latency placement requirement.
Identify that a Proximity Placement Group must be used.
A Proximity Placement Group is an Azure logical grouping capability that keeps virtual machines physically close to each other, minimizing network latency.
3
Evaluate and eliminate incorrect configurations.
Eliminated the options for Availability Sets in a single zone and Spot VMs.
An Availability Set inside a single zone fails to protect against datacenter outages and only offers a 99.95%99.95\% uptime SLA. Spot VMs can be evicted at any time and offer no uptime SLA.

Key Concept

Designing compute high availability in Azure by combining Availability Zones for regional resiliency and Proximity Placement Groups for low latency.
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Topics

Design Compute High Availability

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