Swap stands for exchange. Swapping is the replacement of defective replacement units
(RU) of a system. When swapping, a distinction is made between swapping during operation, hot swap, swapping after the applications have been shut down, warm swap, and swapping when the system is switched off, cold swap. In addition, swapping can take place automatically, as auto-swap, when switching from one system component to another redundant one in the event of a fault, or manually.