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Difficulty: HardAzure Regions, Availability Zones, and Region Pairs

An enterprise is designing a deployment strategy in Azure to host a regulated payroll application. The solution must protect against localized datacenter outages within the primary region, and it must support automatic replication to a secondary region located at least 300 miles away to ensure business continuity during a regional disaster. The primary resources will be managed under a resource group named `RG-HR-Prod` that is created in the `East US` region.

Which configuration represents a valid design that meets these requirements?

  1. A
    Deploy the virtual machines and the replica storage account strictly within the East US region because all resources in RG-HR-Prod must inherit and match the region of their resource group.
  2. B
    Deploy the virtual machines across the East US and West US regions within a single Availability Zone to ensure high availability within the primary region, and configure storage replication to a different zone in East US for disaster recovery.
  3. Deploy the virtual machines across multiple Availability Zones within the East US region, and configure the storage account with Geo-Redundant Storage (GRS) to replicate data to the West US region.Answer
  4. D
    Deploy the virtual machines in a single availability zone that physically spans across both the East US and East US 2 regions to protect against region-wide outages, and configure local storage replication.

Answer

Deploy the virtual machines across multiple Availability Zones within the East US region, and configure the storage account with Geo-Redundant Storage (GRS) to replicate data to the West US region.
The correct option satisfies all constraints: deploying virtual machines across Availability Zones in the primary region (East US) protects against localized datacenter failures. Configuring Geo-Redundant Storage (GRS) replicates data to the paired region (West US), which is situated more than 300 miles away, satisfying disaster recovery needs. Additionally, Azure resources do not inherit or depend on their resource group's location for deployment, meaning resources in West US can be part of a resource group located in East US.

Step-by-Step Solution

1
Identify how to protect against datacenter failures within a single region.
Availability Zones in East US offer independent power, cooling, and networking, protecting VMs from localized datacenter failures.
To satisfy the requirement of protecting against localized datacenter outages.
2
Identify how to protect against region-wide disasters while replication is automated over 300 miles.
Azure Region Pairs are separated by at least 300 miles. Geo-Redundant Storage (GRS) automatically replicates data from East US to its pair, West US.
To satisfy the requirement of automatic replication to a secondary region for disaster recovery.
3
Evaluate the resource group constraints.
Resource group location is only used to store metadata. Resources can reside in different regions from their resource group.
To confirm that the replication destination (West US) is valid despite the resource group being in East US.

Key Concept

Azure Regions, Availability Zones, and Region Pairs
Estimated Time:2m 0s
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Topics

Azure Regions, Availability Zones, and Region Pairs

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