Microsoft Certified: Azure Administrator AssociateImplement and manage storageMedium
A company is hosting a web application in Azure that serves global customers. The application stores user-generated content (images, videos) in Azure Blob Storage. To ensure high availability and disaster recovery across geographical regions, while also allowing read-only access to the secondary region, which redundancy option should be configured for the storage account?
- ALocally-Redundant Storage (LRS)
- BGeo-Redundant Storage (GRS)
- CZone-Redundant Storage (ZRS)
- DRead-Access Geo-Redundant Storage (RA-GRS)
Show answer & explanationAnswer & explanation
Correct answer: D. Read-Access Geo-Redundant Storage (RA-GRS)
Read-Access Geo-Redundant Storage (RA-GRS) provides durability by replicating data to a secondary region hundreds of miles away and also allows read-only access to the data in the secondary region. This meets the requirements for global high availability, disaster recovery, and read access from the secondary region.
Why the other options are wrong
- A. LRS provides local redundancy within a single data center, not geo-redundancy or read access from a secondary region.
- B. GRS replicates data to a secondary region for disaster recovery but does not allow read access to the secondary endpoint unless a failover occurs.
- C. ZRS provides redundancy across availability zones within a single region, not geo-redundancy or read access from a secondary region.
Read-Access Geo-Redundant Storage (RA-GRS)
RA-GRS replicates data to a secondary geographical region hundreds of miles away and provides read-only access to the data in the secondary region, enhancing both durability and availability.
- Data is replicated synchronously in the primary region, then asynchronously to the secondary.
- Provides read access to the secondary endpoint.
- Offers highest durability for Azure storage.
Memory trick: RA-GRS: Global reads, global safety.