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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 | 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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|[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/)) |Yes|Yes|Yes|
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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/)) |No|Yes|Yes|
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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/)) |No|[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/)) |No|Yes|Yes|
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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/)) |No|Yes|Preview|
Copy file name to clipboardExpand all lines: articles/azure-cache-for-redis/cache-how-to-zone-redundancy.md
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In this article, you'll learn how to configure a zone-redundant Azure Cache instance using the Azure portal.
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Azure Cache for Redis Standard (Preview), Premium (Premium), and Enterprise tiers provide built-in redundancy by hosting each cache on two dedicated virtual machines (VMs). Even though these VMs are located in separate [Azure fault and update domains](../virtual-machines/availability.md) and highly available, they're susceptible to datacenter level failures. Azure Cache for Redis also supports zone redundancy in its Standard, Premium and Enterprise tiers. A zone-redundant cache runs on VMs spread across multiple [Availability Zones](../reliability/availability-zones-overview.md). It provides higher resilience and availability.
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Azure Cache for Redis Standard (Preview), Premium (Premium), and Enterprise tiers provide built-in redundancy by hosting each cache on two dedicated virtual machines (VMs). Even though these VMs are located in separate [Azure fault and update domains](../virtual-machines/availability.md) and highly available, they're susceptible to data center-level failures. Azure Cache for Redis also supports zone redundancy in its Standard (preview), Premium (preview) and Enterprise tiers. A zone-redundant cache runs on VMs spread across multiple [Availability Zones](../reliability/availability-zones-overview.md). It provides higher resilience and availability.
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## Prerequisites
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:::image type="content" source="media/cache-how-to-zone-redundancy/cache-enterprise-create-zones.png" alt-text="Screenshot showing the Advanced tab with a red box around Zone redundancy.":::
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Automatic zone allocation increases the overall availability of your cache by automatically spreading it across multiple availability zones. Using availability zones makes the cache more resilient to outages in a datacenter. For more information, see [Zone redundancy](cache-high-availability.md#zone-redundancy).
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Automatic zone allocation increases the overall availability of your cache by automatically spreading it across multiple availability zones. Using availability zones makes the cache more resilient to outages in a data center. For more information, see [Zone redundancy](cache-high-availability.md#zone-redundancy).
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> [!IMPORTANT]
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> Automatic Zone Allocation cannot be modified once enabled for a cache.
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> [!IMPORTANT]
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> Enabling Automatic Zone Allocation is currently NOT supported for Geo Replicated caches or caches with VNET injection.
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1. Availability zones can be selected manually for Premium tier caches. The count of availability zones must always be less than or equal to the Replica count for the cache.
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### Can I update my existing Standard or Premium cache to use zone redundancy?
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Yes, updating an existing Standard or Premium cache to use zone redundancy is supported. You can enable it by selecting **Allocate Zones automatically** from the **Advanced settings** on the Resource menu. You cannot disable zone redundancy once you have enabled it.
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Yes, updating an existing Standard or Premium cache to use zone redundancy is supported. You can enable it by selecting **Allocate Zones automatically** from the **Advanced settings** on the Resource menu. You cannot disable zone redundancy once you have enabled it.
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> [!IMPORTANT]
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> Automatic Zone Allocation cannot be modified once enabled for a cache.
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> [!IMPORTANT]
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> Enabling Automatic Zone Allocation is currently NOT supported for Geo Replicated caches or caches with VNet injection.
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### How much does it cost to replicate my data across Azure Availability Zones?
<sup>1</sup> If Azure Storage and Azure AI Search are in the same region, the connection to storage is made over the Microsoft backbone network, which means a shared private link is redundant for this configuration. However, if you already set up a private endpoint for Azure Storage, you should also set up a shared private link or the connection is refused on the storage side. Also, if you're using multiple storage formats for various scenarios in search, make sure to create a separate shared private link for each subresource.
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