Certified: The CompTIA Security+ Audio Course
Episode 197: Mean Time Metrics and System Resilience (Domain 5)
16 Jun 2025
System resilience depends not only on planning but on measurable performance—and in this episode, we explore four key metrics that define how systems behave under failure: Mean Time to Repair (MTTR), Mean Time Between Failures (MTBF), Mean Time to Detect (MTTD), and Mean Time to Respond (MTTR—the other one). MTTR (repair) reflects how long it takes to fix a failed system, while MTBF gives insight into overall reliability by measuring the average time between those failures. MTTD and MTTR (response) are especially critical in security, measuring how fast threats are detected and acted upon once an alert is triggered. These values help organizations benchmark their operational readiness, drive investment decisions, and evaluate vendor performance. Tracking them over time allows teams to assess whether improvements are working—or whether resiliency is just assumed, not proven. In security and continuity, time isn’t just money—it’s exposure.
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