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Recommended for: **High availability**, **Disaster recovery - intra region**
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Azure Cache for Redis supports zone redundant configurations in the Premium and Enterprise tiers. A zone redundant cache can place its nodes across different Azure Availability Zones in the same region. It eliminates data center or AZ outage as a single point of failure and increases the overall availability of your cache.
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Azure Cache for Redis supports zone redundant configurations in the Premium and Enterprise tiers. A [zone redundant cache](cache-how-to-zone-redundancy.md) can place its nodes across different [Azure Availability Zones](../reliability/availability-zones-overview.md) in the same region. It eliminates data center or Availability Zone outage as a single point of failure and increases the overall availability of your cache.
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If a cache is configured to use two or more zones as described earlier in the article, the cache nodes are created in different zones. When a zone goes down, cache nodes in other zones are available to keep the cache functioning as usual.
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Azure Cache for Redis supports zone redundant configurations in the Premium and Enterprise tiers. A [zone redundant cache](cache-how-to-zone-redundancy.md) can place its nodes across different [Azure Availability Zones](../reliability/availability-zones-overview.md) in the same region. It eliminates data center or Availability Zone outage as a single point of failure and increases the overall availability of your cache.
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> [!IMPORTANT]
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> You can now enable _Automatic Zone Allocation_ for all caches in applicable tiers and regions. For more information, see [Enable zone redundancy for Azure Cache for Redis](cache-how-to-zone-redundancy.md).
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### Premium tier
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### Standard and Premium tiers
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The following diagram illustrates the zone redundant configuration for the Premium tier:
Azure Cache for Redis distributes nodes in a zone redundant cache in a round-robin manner over the selected Availability Zones. It also determines the node that serves as the primary initially.
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For Standard and Premium deployments where you selected **Select zones automatically**, the zones are selected automatically.
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#### Zone Down Experience for Premium tier
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A zone redundant cache provides automatic failover. When the current primary node is unavailable, one of the replicas takes over. Your application may experience higher cache response time if the new primary node is located in a different AZ. Availability Zones are geographically separated. Switching from one AZ to another alters the physical distance between where your application and cache are hosted. This change impacts round-trip network latencies from your application to the cache. The extra latency is expected to fall within an acceptable range for most applications. We recommend you test your application to ensure it does well with a zone-redundant cache.
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