Certified Data Centre Professional (CDCP) Practice Exam 2026 – All-In-One Study Resource to Ace Your Certification!

The correct formula for Mean Time Between Failures (MTBF) is determined by the relationship between Mean Time to Repair (MTTR) and Mean Time to Failure (MTTF). MTBF quantifies the average elapsed time between the inherent failures of a system during normal operations, providing a measure of system reliability.

In this context, MTBF is calculated as the sum of the Mean Time to Repair (MTTR), which measures how long it takes to fix a system after a failure has occurred, and the Mean Time to Failure (MTTF), which reflects the expected time until the next failure during normal operation. Thus, when combining these two measurements, you arrive at the correct expression for MTBF:

MTBF = MTTR + MTTF.

The other options misrepresent the relationships between these metrics. They do not correctly express how MTBF relates to MTTR and MTTF, leading to incorrect interpretations of system performance metrics. Understanding this relationship is crucial in managing and optimizing data center operations.