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ISACA Certified in Risk and Information Systems Control · Isaca
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The BEST key performance indicator (KPI) to measure the ability to deliver uninterrupted IT services is mean time between failures (MTBF). MTBF specifically measures the average time between unexpected outages or failures. A higher MTBF indicates IT services are experiencing less unplanned interruptions in service. In comparison: A) Unplanned downtime only measures the duration of interruptions, not the gap between them.
A. Mean time between failures The "Mean time between failures" (MTBF) is a commonly used metric to measure the reliability and stability of a system or service. Specifically, it provides an average time duration between system failures. A higher MTBF indicates that a system or service is more reliable and can deliver uninterrupted services for a longer time before experiencing a failure. This makes MTBF the best KPI among the options provided to measure the ability to deliver uninterrupted IT services.
If the goal is uninterrupted services then unplanned down time would be best indication on how much the service is interrupted. MTBF let's you know system reliability