Learn in the textbookReliability Design
DefinitionCold standby (コールドスタンバイ) keeps the standby system shut down and, after the primary system fails, starts it up before switching over.
ExplanationThe standby system is left powered off, or at least not yet processing anything. Because it has to be started and configured after the failure occurs, it takes a while for business to resume. The equipment does not run while it waits, so upkeep costs are low.
AnalogyOn a winter morning, a car that has gone stone cold cannot leave until the engine has been started and warmed up.