AZ-104 Question 77
Single answerYour organization is deploying a global e-commerce application that must remain available even if the primary Azure region experiences an outage. You plan to create a new Azure Storage account to host static files and transactional data. The business requires that all data stored in the secondary region should be immediately readable if the primary region goes offline. Which redundancy option should you select while creating the storage account?
- 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) not only replicates the data to a secondary region but also allows read operations from the secondary location at any time, providing immediate data availability during a regional outage.
- A. Incorrect.
LRS only keeps multiple copies of data in the same data center, so it will not protect against a regional outage.
- B. Incorrect.
GRS replicates data across different regions but does not offer read access to the secondary unless the primary fails over, which is not immediate by default.
- C. Correct.
RA-GRS is designed to provide geo-redundancy and also immediate read access to the replicated data in the secondary region, satisfying the high availability requirement.
- D. Incorrect.
ZRS keeps data copies across different availability zones within the same region, so it doesn’t provide geo-redundancy across regions.