N+1 Redundancy: One Spare for the Whole System
N+1 redundancy is like having one spare tire for your whole car. You have N active components and one shared, passive backup. It's used in server racks or power supplies for high availability without doubling costs.
N+1 redundancy provides high availability by adding one backup for a group of N active components, like a single spare tire for a fleet of cars. It's used for data center power supplies or server clusters where full duplication is too costly. The footgun: the system is vulnerable during the repair window. While the spare is active, a second failure will cause an outage as there's no more redundancy.
Read the original → Wikipedia: N+1 redundancy
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- #reliability
- #infrastructure
- #high availability
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