Definitions for "Hot-swap"
To remove and replace a system component while power is on and the system is functional (without first shutting the system down).
Refers to devices that can be removed from, or inserted into, a system without first turning off the power supply to the system.
To pull out a component from a system and plug in a new one while the power is still on and the unit is still operating. Redundant systems can be designed to swap drives, circuit boards, power supplies, virtually anything that is duplexed within the computer. TechWeb