2017-05-05 05:24:04 +00:00
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---
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2020-04-07 18:55:19 +00:00
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layout: docs
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page_title: Consul Enterprise 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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2017-05-05 05:24:04 +00:00
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---
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2020-03-24 20:06:20 +00:00
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# Redundancy Zones
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2017-05-05 05:24:04 +00:00
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2020-04-23 22:13:18 +00:00
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<EnterpriseAlert>
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2020-07-08 23:09:00 +00:00
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This feature requires{' '}
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<a href="https://www.hashicorp.com/products/consul/">Consul Enterprise</a>{' '}
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with the Global Visibility, Routing, and Scale module.
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2020-04-23 22:13:18 +00:00
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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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2020-04-06 20:27:35 +00:00
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servers alongside voting servers on a per availability zone basis.
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2020-03-24 20:06:20 +00:00
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2020-04-06 20:27:35 +00:00
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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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2020-04-09 23:20:00 +00:00
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[enhanced read scalability](/docs/enterprise/read-scale) by also including recovery
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2020-04-06 20:27:35 +00:00
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capabilities.
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2020-03-24 20:06:20 +00:00
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2020-08-13 21:02:44 +00:00
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For more information, review the HashiCorp Learn tutorial on
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[Redundancy Zones](https://learn.hashicorp.com/tutorials/consul/autopilot-datacenter-operations#redundancy-zones),
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2020-10-14 15:23:05 +00:00
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as well as the documentation for [Consul Autopilot](/commands/operator/autopilot).
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