fuel-docs/pages/reference-architecture/0014-compact.rst

Reference Architectures: HA Compact, HA Compact

Multi-node (HA) deployment (Compact)

Production environments typically require high availability, which involves several architectural requirements. Specifically, you will need at least three controllers, and certain components will be deployed in multiple locations to prevent single points of failure. That's not to say, however, that you can't reduce hardware requirements by combining your storage, network, and controller nodes:

We'll take a closer look at the details of this deployment configuration in Close_look_Compact section.