Definitions for "Single Point of Failure"
A term used to describe a unique hardware compponent, data path or source of a service, activity, and/or process. There is no alternate component and a loss of that element could lead to a catestrophic failure of a critical function.
a hardware or software component that is part of a critical path but is not backed up by redundant components
This is where one part of a system will make the whole system fail. In cluster computing this is typically the batch manager, which if it fails the compute resource are no longer accessible by users.
Keywords:  achilles, heel, you
Keywords:  flaw, design
a design flaw