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articles/azure-cache-for-redis/cache-high-availability.md

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ms.service: cache
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ms.topic: conceptual
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ms.date: 03/29/2022
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ms.date: 10/19/2022
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ms.author: franlanglois
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| ------------------- | ------- | ------- | :------: | :---: | :---: |
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| [Standard replication](#standard-replication-for-high-availability)| Dual-node replicated configuration in a single data center with automatic failover | 99.9% (see [details](https://azure.microsoft.com/support/legal/sla/cache/v1_1/)) ||||
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| [Zone redundancy](#zone-redundancy) | Multi-node replicated configuration across Availability Zones, with automatic failover | 99.9% in Premium; 99.99% in Enterprise (see [details](https://azure.microsoft.com/support/legal/sla/cache/v1_1/)) |-|||
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| [Geo-replication](#geo-replication) | Linked cache instances in two regions, with user-controlled failover | Premium; Enterprise (see [details](https://azure.microsoft.com/support/legal/sla/cache/v1_1/)) |-|Passive|Active|
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| Geo-replication | Linked cache instances in two regions, with user-controlled failover | Premium; Enterprise (see [details](https://azure.microsoft.com/support/legal/sla/cache/v1_1/)) |-| [Passive](#passive-geo-replication) | [Active](#active-geo-replication) |
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| [Import/Export](#importexport) | Point-in-time snapshot of data in cache. | 99.9% (see [details](https://azure.microsoft.com/support/legal/sla/cache/v1_1/)) |-|||
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| [Persistence](#persistence) | Periodic data saving to storage account. | 99.9% (see [details](https://azure.microsoft.com/support/legal/sla/cache/v1_1/)) |-||Preview|
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| West US 2 | Switzerland North | | | |
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Zone-redundant Enterprise and Enterprise Flash tier caches are available in the following regions:
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Zone-redundant Enterprise and Enterprise Flash tier caches are available in the following regions:
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| Americas | Europe | Middle East | Africa | Asia Pacific |
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| West US 2 | | | | |
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\* Enterprise Flash tier not available in this region.
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\* Enterprise Flash tier not available in this region.
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#### Availability zone redeployment and migration
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Currently, the only way to convert your cache from a non-AZ configuration to an AZ configuration is to redeploy the cache. To learn how to redeploy your current cache, see [Migrate an Azure Cache for Redis instance to availability zone support](https://learn.microsoft.com/azure/availability-zones/migrate-cache-redis)
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Currently, the only way to convert your cache from a non-AZ configuration to an AZ configuration is to redeploy the cache. To learn how to redeploy your current cache, see [Migrate an Azure Cache for Redis instance to availability zone support](/azure/availability-zones/migrate-cache-redis).
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## Persistence
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Applicable tiers: **Premium**
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Recommmended for: **Disaster recovery - single region**
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Recommended for: **Disaster recovery - single region**
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[Geo-replication](cache-how-to-geo-replication.md) is a mechanism for linking two or more Azure Cache for Redis instances, typically spanning two Azure regions. Geo-replication is designed mainly for cross-region disaster recovery. Two Premium tier cache instances are connected through geo-replication in a way that provides reads and writes to your primary cache, and that data is replicated to the secondary cache.
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For more information on how to set it up, see [Configure geo-replication for Premium Azure Cache for Redis instances](./cache-how-to-geo-replication.md).
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If the region hosting the primary cache goes down, you’ll need to start the failover by: first, unlinking the secondary cache, and then, updating your application to point to the secondary cache for reads and writes.
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Applicable tiers: **Enterprise**, **Enterprise Flash**
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Recommmended for: **High Availability**, **Disaster recovery - multi-region**
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Recommended for: **High Availability**, **Disaster recovery - multi-region**
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The Enterprise tiers support a more advanced form of geo-replication called [active geo-replication](cache-how-to-active-geo-replication.md) that offers both higher availability and cross-region disaster recovery across multiple regions. The Azure Cache for Redis Enterprise software uses conflict-free replicated data types to support writes to multiple cache instances, merges changes, and resolves conflicts. You can join up to five Enterprise tier cache instances in different Azure regions to form a geo-replication group.
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