consul/website/content/docs/enterprise/redundancy.mdx

---
layout: docs
page_title: Consul Enterprise Redundancy Zones
description: >-
  Consul Enterprise redundancy zones enable hot standby servers on a per
  availability zone basis.
---

# Redundancy Zones

<EnterpriseAlert>
  This feature requires{' '}
  <a href="https://www.hashicorp.com/products/consul/">Consul Enterprise</a>{' '}
  with the Global Visibility, Routing, and Scale module.
</EnterpriseAlert>

Consul Enterprise redundancy zones provide
both scaling and resiliency benefits by enabling the deployment of non-voting
servers alongside voting servers on a per availability zone basis.

When using redundancy zones, if an operator chooses to deploy Consul across 3 availability zones, they
could have 2 (or more) servers (1 voting/1 non-voting) in each zone. In the event that a voting
member in an availability zone fails, the redundancy zone configuration would automatically
promote the non-voting member to a voting member. In the event that an entire availability
zone was lost, a non-voting member in one of the existing availability zones would promote
to a voting member, keeping server quorum. This capability functions as a "hot standby"
for server nodes while also providing (and expanding) the capabilities of
[enhanced read scalability](/docs/enterprise/read-scale) by also including recovery
capabilities.

For more information, review the HashiCorp Learn tutorial on
[Redundancy Zones](https://learn.hashicorp.com/tutorials/consul/autopilot-datacenter-operations#redundancy-zones),
as well as the documentation for [Consul Autopilot](/commands/operator/autopilot).