Microsoft Certified: Azure Solutions Architect ExpertDesign business continuity solutionsHard
A global media company uses Azure Blob Storage to store large video files that are frequently accessed by users worldwide. The company requires maximum durability and availability, even in the event of a regional outage. Data consistency is important but eventual consistency is acceptable for reads from the secondary region. Which Azure Storage redundancy option should be selected for the storage account?
- AZone-redundant storage (ZRS)
- BGeo-redundant storage (GRS)
- CGeo-zone-redundant storage (GZRS)
- DLocally-redundant storage (LRS)
Show answer & explanationAnswer & explanation
Correct answer: C. Geo-zone-redundant storage (GZRS)
Geo-zone-redundant storage (GZRS) combines the high availability of ZRS within the primary region with asynchronous replication to a geographically separate region, providing maximum durability and availability, including protection against regional outages, while allowing for eventual consistency for reads from the secondary.
Why the other options are wrong
- A. ZRS provides durability across availability zones within a single region, not against regional outages.
- B. GRS provides durability against regional outages but only uses LRS in the primary region, offering less availability within the primary region compared to ZRS.
- D. LRS provides durability within a single data center, not against regional outages.
Azure Geo-zone-redundant storage (GZRS)
GZRS provides maximum durability by synchronously replicating data across three Azure availability zones in the primary region, and then asynchronously replicating that data to a single physical location in a secondary region.
- Combines ZRS in primary region with GRS.
- Synchronous replication across 3 AZs in primary.
- Asynchronous replication to a secondary region.
- Offers highest durability and availability against regional disasters.
Memory trick: GZRS gives you Global Zone Resilience for your Storage.