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Difficulty: MediumReliability, Predictability, and Disaster Recovery

An online retail company hosts its web application on Azure. The application must meet the following operational specifications:

- The application must remain accessible to users even if a single server rack or power source within the primary region's datacenter fails.
- The company must be able to restore the application and its database in a different geographic location if a major natural disaster renders the entire primary region offline.

Which of the following cloud concepts do these two requirements describe?

  1. A
    The first requirement describes high availability, and the second requirement describes replicating resources to an Availability Zone in a different region.
  2. B
    The first requirement describes elasticity, and the second requirement describes scalability.
  3. The first requirement describes high availability, and the second requirement describes disaster recovery.Answer
  4. D
    The first requirement describes disaster recovery, and the second requirement describes high availability.

Answer

The first requirement describes high availability, and the second requirement describes disaster recovery.
The requirement to maintain access during localized hardware failures within a datacenter is a feature of high availability, which focuses on keeping services running with minimal downtime within a region. The requirement to recover from a catastrophic regional failure by restoring services in a different geographic location is a feature of disaster recovery.

Step-by-Step Solution

1
Analyze the first requirement, which involves keeping the application accessible during a localized hardware or power failure within the primary region's datacenter.
This relates to High Availability (HA), which focuses on maximizing service uptime and handling local failures within a single region.
High Availability mechanisms, such as redundant power supplies and local clustering, protect against local component failures.
2
Analyze the second requirement, which involves recovering the application and its database in a different geographic location if the entire primary region goes offline.
This relates to Disaster Recovery (DR), which focuses on recovering operations after a catastrophic event or regional outage.
Disaster Recovery involves failover strategies to secondary regions to restore service during major outages.

Key Concept

Distinction between High Availability and Disaster Recovery in cloud architecture.
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Topics

Reliability, Predictability, and Disaster Recovery

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