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A company is implementing a new application that stores critical data in Azure Blob Storage. The data needs to be highly available and resilient to regional outages, with synchronous replication across multiple availability zones within a region. You need to select the appropriate redundancy option for the storage account.
- AGeo-Redundant Storage (GRS)
- BRead-Access Geo-Redundant Storage (RA-GRS)
- CZone-Redundant Storage (ZRS)
- DLocally Redundant Storage (LRS)
Show answer & explanationAnswer & explanation
Correct answer: C. Zone-Redundant Storage (ZRS)
Zone-Redundant Storage (ZRS) synchronously replicates data across three Azure availability zones in the primary region. This provides excellent high availability and resilience to regional outages that affect a single availability zone, without replicating to a secondary region, which aligns with the requirement for synchronous replication within a region.
Why the other options are wrong
- A. GRS asynchronously replicates data to a secondary region, which is not synchronous and extends beyond a single region.
- B. RA-GRS is GRS with read access to the secondary region; it's still asynchronous and cross-regional, not meeting the synchronous within-region requirement.
- D. LRS replicates data within a single data center, offering less resilience to regional outages.
Zone-Redundant Storage (ZRS)
Zone-Redundant Storage (ZRS) synchronously replicates your data across three Azure availability zones in the primary region. This provides high availability and resilience against failures within a single data center or availability zone.
- Synchronous replication across three availability zones.
- Offers resilience against availability zone outages.
- Provides excellent data durability.
- Data remains within the primary region.
Memory trick: Redundancy: LRS for local, ZRS for zones, GRS for geo, GZRS for global zones.