Learn in the textbookApplying Virtualization and System Usage/Operation Modes
DefinitionLive migration (ライブマイグレーション) moves a running virtual machine to another physical server without stopping it, so it keeps processing at the destination.
ExplanationEven during physical server maintenance or hardware replacement, service to users does not have to stop. It can also shift virtual machines from a heavily loaded physical server to one with spare capacity to share the load.
AnalogyIt is like moving passengers from a moving train onto another train running alongside it. The passengers keep heading to their destination without breaking their journey.
Memory hookLive as in a live broadcast. Picture switching studios without interrupting the broadcast: not stopping is built into the name.