Single point of failure
Updated: 09/12/2023 by Computer Hope
A single point of failure, also known as SPOF, is any system component that causes the whole system to stop working if it fails. When designing reliable systems, SPOFs can be avoided by implementing redundant components and replicating critical parts of the system. For example, a computer may implement RAID (redundant array of independent disks) storage so that if a single disk fails, the system can continue operating.
On a larger scale, a website may replicate application servers. If a single server encounters a critical error, the service automatically switches to another server, and end users are not prevented from using the application.
Tip
Remember the quote "Two is one, one is none" when thinking about a single point of failure.