What percentage-based metric reflects the computing power needed during a disaster?

The choice of Recovery Service Level (RSL) is particularly fitting because this metric is indicative of the percentage of computing resources required to ensure continuity during a disaster scenario. RSL is used to define the level of service expected during recovery periods, including considerations of how much computing power or capacity will be available. This is essential in disaster recovery planning since it highlights the commitment to maintain certain operational performance, guiding both technical implementations and resource allocations.

The other options, while relevant to disaster recovery and IT service management, do not specifically address the percentage of computing power required. Recovery Time Objectives (RTO) focuses on the target time to restore operations after a disruption, while Mean Time to Repair (MTTR) involves the average time to fix a failed system or component. Service Level Expectations (SLE) describe the overall expectations of service but do not quantify computing power in the context of disaster recovery. Thus, Recovery Service Level effectively encapsulates the crucial aspect of computing power requirements needed to sustain operations when faced with disaster recovery challenges.