Microsoft Azure Solutions Architect Expert AZ-305 Practice Question

Read-access geo-zone-redundant storage (RA-GZRS) keeps three synchronous copies of each object across separate availability zones in the primary region (ZRS) and maintains asynchronous copies in the paired secondary region. The data in the secondary region is exposed through a read-only endpoint, so applications can continue to read if the primary region is unavailable. When Microsoft-initiated automatic account failover occurs, the DNS entry for the storage account is updated, so applications do not need configuration changes.

Locally redundant storage (LRS) replicates only within a single datacenter and offers no regional protection. Zone-redundant storage (ZRS) protects against a zone outage but not a regional outage. Standard geo-redundant storage (GRS) provides regional replication, yet writes are not synchronized across zones in the primary region and customer-initiated failover is required, so it fails to satisfy the synchronous AZ durability and automatic failover requirements.