AZ-104 Question 80
Single answerYou run a mission-critical application that must stay online even if an entire Azure region goes offline. The stored data must remain readable at all times with minimal downtime. Which Azure Storage replication option should you configure to enable immediate read access from the secondary region when the primary region fails?
- A
Locally redundant storage (LRS)
- B
Geo-redundant storage (GRS)
- C
Read-access geo-redundant storage (RA-GRS)
- D
Zone-redundant storage (ZRS)
Show answer and explanation
Correct answer: C
Explanation
Read-access geo-redundant storage (RA-GRS) is the correct choice because it ensures geo-replication and provides continuous read access from a secondary region, meeting the requirement of minimal downtime and keeping the application highly available even if an entire Azure region experiences a failure.
- A. Incorrect.
LRS replicates data within a single data center, so it doesn’t provide cross-region failover or read access in another region.
- B. Incorrect.
GRS replicates data globally, but you cannot directly read from the secondary region unless a failover is triggered, which incurs downtime before read access is enabled.
- C. Correct.
RA-GRS replicates data globally and allows you to read from the secondary region at any time, providing minimal downtime and continuous availability if the primary region goes offline.
- D. Incorrect.
ZRS replicates data across availability zones within one region, so it does not protect against an entire region outage or enable cross-region reads.