Disasters occur in many forms. Some disasters happen suddenly, when they do, they stop all processing at a single point in time. A more likely scenario happens when a disaster interrupts operations in stages that occur over several seconds or even minutes. This is often referred to as a rolling disaster. You must, therefore, plan for recovery from a potential disaster that causes system failures that are immediate, intermittent, or gradual. IBM®’s remote copy functions address this real-world situation.