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Difficulty: Very hardAzure Regions, Availability Zones, and Region Pairs

An organization is designing a high-availability and disaster recovery architecture in Azure for a regulatory-compliant application. The solution must satisfy the following requirements:

* Active virtual machines (VMs) must remain operational even in the event of a complete data center power outage in the primary hosting location.
* Database backups must replicate to a secondary region located at least 300 miles away for disaster recovery, while ensuring all data and backups remain strictly within the United Kingdom national boundary.
* Resource metadata and deployment logs must be stored in a Resource Group located in the North Europe region.

Which configuration should the organization implement to meet all requirements?

  1. A
    Deploy the VMs inside the North Europe region to match the Resource Group location, distribute them across Availability Zones in North Europe, and replicate the database to West Europe.
  2. B
    Deploy the VMs such that Availability Zone 1 is located in UK South and Availability Zone 2 is located in UK West, and replicate the database to North Europe.
  3. Deploy the VMs across multiple Availability Zones in UK South, replicate the database to the UK West region, and provision these resources inside the Resource Group located in North Europe.Answer
  4. D
    Deploy the VMs in a single availability set within UK South, and rely on the region pair replication to UK West to provide high availability during a local data center power outage.

Answer

Deploy the VMs across multiple Availability Zones in UK South, replicate the database to the UK West region, and provision these resources inside the Resource Group located in North Europe.
Deploying resources across Availability Zones within UK South provides high availability and resilience to data center power outages since Availability Zones are unique physical locations with independent power, cooling, and networking within a single region. Replicating the database to the paired region, UK West, ensures disaster recovery while keeping all data within the United Kingdom national boundary (satisfying data sovereignty). Finally, Azure resources do not have to reside in the same region as the Resource Group containing them; the Resource Group only stores resource metadata and can be in North Europe while the resources themselves reside in the UK.

Step-by-Step Solution

1
Determine the placement of active virtual machines to survive a complete data center power outage.
The VMs must be deployed across multiple Availability Zones within the primary region (UK South).
Availability Zones provide power, cooling, and network isolation within a single region, safeguarding against single data center failures.
2
Identify the appropriate region for disaster recovery that meets the 300-mile and data residency requirements.
UK West must be selected as the replication target.
UK South and UK West are Azure region pairs located in the United Kingdom, satisfying both the minimum distance requirement and the national data sovereignty constraint.
3
Evaluate if resources can be placed in a Resource Group located in a different region (North Europe).
Yes, resources can reside in a different region than their containing Resource Group.
The Resource Group's location only determines where its metadata is stored, not where the deployed resources must be located.

Key Concept

Decoupling of Resource Group locations, boundaries of Azure Availability Zones, and the geography constraints of Azure Region Pairs.
Estimated Time:2m 0s
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Topics

Azure Regions, Availability Zones, and Region Pairs

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