Non-Redundant Architectures

Non-redundant architectures are system designs that intentionally avoid redundancy, meaning they do not include duplicate components, data, or processes to ensure reliability or fault tolerance. This approach prioritizes simplicity, cost-efficiency, and minimal resource usage, often at the expense of high availability and resilience. It is commonly used in scenarios where failures are acceptable or where redundancy would be impractical due to constraints like budget, complexity, or performance overhead.

Also known as: Nonredundant Architectures, Non Redundant Systems, Single-Point-of-Failure Architectures, Non-Fault-Tolerant Designs, Minimalist Architectures

Why learn Non-Redundant Architectures?

Developers should consider non-redundant architectures when building systems where occasional downtime or data loss is tolerable, such as in development environments, low-criticality applications, or resource-constrained projects like IoT devices or edge computing. This approach is also useful for prototyping, testing, or in situations where simplicity and cost savings outweigh the need for high reliability, as it reduces complexity and maintenance efforts compared to redundant designs.

Learning Resources

• docs: System Design Primer: Redundancy and Fault Tolerance
• docs: AWS Well-Architected Framework: Reliability Pillar
• video: Non-Redundant vs. Redundant Systems in Software Architecture
• book: Designing Data-Intensive Applications: Chapter on Fault Tolerance
• course: Coursera Course: Software Architecture