Zone-redundant storage (ZRS) replicates data synchronously across three availability zones within a single region, ensuring high durability and availability even if one zone becomes unavailable.
Locally redundant storage (LRS) keeps multiple copies within a single storage cluster, but all copies are in the same zone, making it less resilient to zone failures.
Geo-redundant storage (GRS) replicates data across two geographically separate regions to protect against regional outages.
Read-access geo-redundant storage (RA-GRS) provides the same cross-regional data replication as GRS but with the added capability of read access to the secondary region. However, like GRS, its primary focus is on cross-regional redundancy rather than guaranteeing availability within a single region.
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Microsoft Azure Fundamentals AZ-900
Azure Architecture and Services
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