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Difficulty: MediumDesign Compute High Availability

An investment bank is designing the compute infrastructure for a core ledger processing system on Azure. The system must meet a virtual machine uptime SLA of 99.99% and must remain available even if an entire Azure zone experiences an outage. Which two configurations should you include in the design?

  1. Deploy the virtual machines across two or more Availability Zones in the region.Answer
  2. Use a Standard Load Balancer to distribute traffic to the virtual machines.Answer
  3. C
    Deploy the virtual machines within a single Availability Zone using a single Availability Set.
  4. D
    Deploy the virtual machines within a single Proximity Placement Group restricted to a single Availability Zone.

Answer

To meet the requirements, you should deploy the virtual machines across two or more Availability Zones in the region and use a Standard Load Balancer to distribute traffic to them.
Distributing the virtual machines across multiple Availability Zones is required to meet the 99.99% SLA and ensure resilience against zone outages. A Standard Load Balancer is necessary to route traffic to virtual machines across different zones because it supports zone-redundant backend pools.

Step-by-Step Solution

1
Analyze the high availability and SLA requirements.
The workload requires a 99.99% virtual machine uptime SLA and resilience against zone-level failures.
This establishes the baseline architectural redundancy required.
2
Determine the appropriate virtual machine placement strategy.
Select multi-zone deployment (deploying virtual machines across at least two Availability Zones).
Azure offers a 99.99% uptime SLA only when two or more VM instances are deployed across two or more Availability Zones in the same region.
3
Select a load balancing solution that supports the placement strategy.
Use a Standard Load Balancer.
Standard Load Balancer is a zone-redundant service that can route traffic across multiple Availability Zones, whereas Basic Load Balancer is not zone-redundant.

Key Concept

Designing high availability for Azure compute using Availability Zones and Standard Load Balancer.
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Topics

Design Compute High Availability

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