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articles/reliability/includes/storage/reliability-storage-architecture-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+[Locally redundant storage (LRS)](/azure/storage/common/storage-redundancy?#locally-redundant-storage), the lowest-cost redundancy option, automatically stores and replicates three copies of your data within a single datacenter. Although LRS protects your data against server rack and drive failures, it doesn't account for disasters such as fire or flooding within a datacenter. In the face of such disasters, all replicas of a storage account configured to use LRS might be lost or unrecoverable.
+
+:::image type="content" source="../../media/reliability-storage/locally-redundant-storage.png" alt-text="Diagram showing how data is replicated in availability zones with LRS" lightbox="../../media/reliability-storage/locally-redundant-storage.png" border="false":::
+
+Zone-redundant storage (ZRS) and geo-redundant storage (GRS/GZRS) provide additional protections, and are described in detail in this article.

articles/reliability/includes/storage/reliability-storage-availability-zone-configure-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+- **Migration**. To convert an existing storage account to ZRS and learn about migration options and requirements, see [Change how a storage account is replicated](/azure/storage/common/redundancy-migration).
+
+- **Disable zone redundancy.** Convert ZRS accounts back to a nonzonal configuration (such as LRS) through the same redundancy configuration change process.

articles/reliability/includes/storage/reliability-storage-availability-zone-cost-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+When you enable ZRS, you're charged at a different rate than locally redundant storage due to the additional replication and storage overhead.

articles/reliability/includes/storage/reliability-storage-availability-zone-down-experience-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+- **Detection and response:** Microsoft automatically detects zone failures and initiates failover processes. No customer action is required for zone-redundant storage accounts.
+
+- **Active requests:** In-flight requests might be dropped during the failover and should be retried. Applications should [implement retry logic](#transient-faults) to handle these temporary interruptions.
+
+- **Expected data loss:** No data loss occurs during zone failures because data is synchronously replicated across multiple zones before write operations complete.
+
+- **Expected downtime:** A small amount of downtime - typically, a few seconds - may occur during automatic failover as traffic is redirected to healthy zones.
+
+- **Traffic rerouting.** Azure automatically reroutes traffic to the remaining healthy availability zones. The service maintains full functionality using the surviving zones with no customer intervention required.

articles/reliability/includes/storage/reliability-storage-availability-zone-failback-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+When the failed availability zone recovers, Azure Storage automatically restores normal operations across all of the availability zones. During failback, the service automatically ensures data consistency by synchronizing any operations that occurred during the outage period.

articles/reliability/includes/storage/reliability-storage-availability-zone-normal-operations-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+- **Traffic routing between zones**: Storage with ZRS automatically distributes requests across storage clusters in multiple availability zones. Traffic distribution is transparent to applications and requires no client-side configuration.
+
+- **Data replication between zones**: All write operations to ZRS are replicated synchronously across all availability zones within the region. When you upload or modify data, the operation isn't considered complete until the data has been successfully replicated across all of the availability zones. This synchronous replication ensures strong consistency and zero data loss during zone failures. However, it may result in slightly higher write latency compared to locally redundant storage.

articles/reliability/includes/storage/reliability-storage-availability-zone-region-support-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+Zone-redundant Azure Storage accounts can be deployed [in any region that supports availability zones](../../regions-list.md).

articles/reliability/includes/storage/reliability-storage-availability-zone-support-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+:::image type="content" source="../../media/reliability-storage/zone-redundant-storage.png" alt-text="Diagram showing how data is replicated in the primary region with ZRS" lightbox="../../media/reliability-storage/zone-redundant-storage.png" border="false":::

articles/reliability/includes/storage/reliability-storage-availability-zone-testing-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+Azure Storage manages replication, traffic routing, failover, and failback for zone-redundant storage. Because this feature is fully managed, you don't need to initiate or validate availability zone failure processes.

articles/reliability/includes/storage/reliability-storage-multi-region-alternative-approach-include.md

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+---
+ title: include file
+ description: include file
+ author: anaharris-ms
+ ms.service: azure
+ ms.topic: include
+ ms.date: 07/02/2024
+ ms.author: anaharris
+ ms.custom: include file
+---
+
+Azure Storage can be deployed across multiple regions using separate storage accounts in each region. This approach provides flexibility in region selection, the ability to use non-paired regions, and more granular control over replication timing and data consistency. When implementing multiple storage accounts across regions, you need to configure cross-region data replication, implement load balancing and failover policies, and ensure data consistency across regions.