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articles/azure-cache-for-redis/cache-how-to-zone-redundancy.md

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ms.author: franlanglois
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ms.service: cache
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ms.topic: conceptual
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ms.date: 06/07/2022
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ms.date: 07/17/2024
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# Enable zone redundancy for Azure Cache for Redis
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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, 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 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, 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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## Prerequisites
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| **Location** | Select a location. | Select a [region](https://azure.microsoft.com/regions/) near other services that will use your cache. |
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| **Cache type** | Select a [Premium or Enterprise tier](https://azure.microsoft.com/pricing/details/cache/) cache. | The pricing tier determines the size, performance, and features that are available for the cache. For more information, see [Azure Cache for Redis Overview](cache-overview.md). |
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1. On the **Advanced** page, for a Premium tier cache, choose **Replica count**.
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1. For Standard or Premium tier cache, select **Advanced** in the Resource menu. To enable zone resiliency with automatic zone allocation, select **Select zones automatically**.
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<!-- I think at some point we have to point out that this is preview -->
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:::image type="content" source="media/cache-how-to-multi-replicas/create-multi-replicas.png" alt-text="Replica count":::
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:::image type="content" source="media/cache-how-to-zone-redundancy/cache-availability-zone.png" alt-text="Screenshot showing the Advanced tab with a red box around Availability zones.:":::
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1. Select **Availability zones**.
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For an Enterprise tier cache, select **Advanced** in the Resource menu. For **Zone redundancy**, select **Zone redundant (recommended)**.
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:::image type="content" source="media/cache-how-to-zone-redundancy/create-zones.png" alt-text="Availability zones":::
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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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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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1. Configure your settings for clustering and/or RDB persistence.
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It takes a while for the cache to be created. You can monitor progress on the Azure Cache for Redis **Overview** page. When **Status** shows as **Running**, the cache is ready to use.
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> [!NOTE]
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> Availability zones can't be changed or enabled after a cache is created.
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## Zone Redundancy FAQ
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- [Why can't I enable zone redundancy when creating a Premium cache?](#why-cant-i-enable-zone-redundancy-when-creating-a-premium-cache)

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