34 lines
1.7 KiB
Plaintext
34 lines
1.7 KiB
Plaintext
---
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layout: docs
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page_title: Redundancy Zones (Enterprise)
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description: >-
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Redundancy zones are regions of a cluster containing "hot standby" servers, or non-voting servers that can replace voting servers in the event of a failure. Learn about redundancy zones and how they improve resiliency and increase fault tolerance without affecting latency.
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---
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# Redundancy Zones
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<EnterpriseAlert>
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This feature requires
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self-managed Consul Enterprise.
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Refer to the [enterprise feature matrix](/consul/docs/enterprise#consul-enterprise-feature-availability) for additional information.
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</EnterpriseAlert>
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Consul Enterprise redundancy zones provide
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both scaling and resiliency benefits by enabling the deployment of non-voting
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servers alongside voting servers on a per availability zone basis.
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When using redundancy zones, if an operator chooses to deploy Consul across 3 availability zones, they
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could have 2 (or more) servers (1 voting/1 non-voting) in each zone. In the event that a voting
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member in an availability zone fails, the redundancy zone configuration would automatically
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promote the non-voting member to a voting member. In the event that an entire availability
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zone was lost, a non-voting member in one of the existing availability zones would promote
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to a voting member, keeping server quorum. This capability functions as a "hot standby"
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for server nodes while also providing (and expanding) the capabilities of
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[enhanced read scalability](/consul/docs/enterprise/read-scale) by also including recovery
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capabilities.
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For more information, complete the [Redundancy Zones](/consul/tutorials/datacenter-operations/autopilot-datacenter-operations#redundancy-zones) tutorial
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and reference the [Consul Autopilot](/consul/commands/operator/autopilot) documentation.
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