AZ-305 Question 142
Single answerA manufacturing company collects real-time sensor data in JSON format from multiple facilities. They also store large image files and other unstructured data for analysis. The solution must remain accessible even if an entire Azure region becomes unavailable, and they want read operations to continue in the event of a regional disruption with minimal administrative overhead. Which Azure Blob Storage configuration meets these requirements?
- A
Deploy the data in a Blob Storage account with locally redundant storage (LRS)
- B
Deploy the data in a Blob Storage account with geo-redundant storage (GRS)
- C
Deploy the data in a Blob Storage account with read-access geo-redundant storage (RA-GRS)
- D
Deploy the data in a Blob Storage account with read-access geo-zone redundant storage (RA-GZRS)
Show answer and explanation
Correct answer: D
Explanation
For mission-critical applications requiring high availability for semi-structured and unstructured data, RA-GZRS is recommended because it offers zone resilience within the primary region and geo-redundancy to a secondary region with immediate read access. This meets the requirement of maintaining read operations during a regional disruption. Refer to Azure Storage redundancy documentation (https://learn.microsoft.com/azure/storage/common/storage-redundancy) for detailed best practices.
- A. Incorrect.
Option 1: LRS only provides redundancy within a single data center in one region. If the entire region goes down, your data would be unavailable. This doesn't meet the high availability requirement across regions.
- B. Incorrect.
Option 2: GRS replicates data to a secondary region but doesn’t provide immediate read access to that secondary. In a regional outage, the storage would have to be manually failed over before it becomes readable.
- C. Incorrect.
Option 3: RA-GRS offers read access in the secondary region for disaster recovery. However, it does not include zone redundancy within the primary region, which can still pose risks in certain failure scenarios.
- D. Correct.
Option 4: RA-GZRS combines zone redundancy in the primary region with geo-redundancy and read access in the secondary region. This provides the highest level of availability and ensures minimal downtime or data loss in regional failure scenarios.