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N+1 redundancy is a technique for improving the reliability of infrastructure, facilities, systems and devices by providing an independent backup of components. The variable N refers to the number of operating components and "+1" refers to a backup. The following are illustrative examples.
Infrastructure A data center has a primary network provider and a secondary provider as a backup (1+1).EquipmentA factory has 10 industrial robots and one backup (10+1).FacilitiesA data center is designed to have redundant power generators, uninterruptible power supplies, cooling systems and network infrastructure. Systems A bank website is deployed to a cloud platform. The site has a dynamic number of active instances with a running backup always ready to replace a failed instance (N+1).
ServersServers may be designed with two or three power supplies with one reserved as a cold backup.
Reliability Engineering
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