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33 lines
1.6 KiB
Plaintext
33 lines
1.6 KiB
Plaintext
---
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layout: docs
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page_title: Consul Enterprise Redundancy Zones
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sidebar_title: Redundancy Zones
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description: >-
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Consul Enterprise redundancy zones enable hot standby servers on a per
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availability zone basis.
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---
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# Redundancy Zones
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<EnterpriseAlert>
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This feature requires <a href="https://www.hashicorp.com/products/consul/">Consul Enterprise</a> with the Global Visibility, Routing, and Scale module.
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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](/docs/enterprise/read-scale) by also including recovery
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capabilities.
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For more information, review the HashiCorp Learn guide on
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[Redundancy Zones](https://learn.hashicorp.com/consul/day-2-operations/autopilot#redundancy-zones),
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as well as the documentation for [Consul Autopilot](/docs/commands/operator/autopilot).
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