Which statement correctly defines uptime?

Which statement correctly defines uptime?

• A. The proportion of time a system is operational
• B. The amount of work processed per time unit
• C. The total storage capacity
• D. The number of users connected concurrently

Answer: (A)

Uptime is the proportion of time a system is operational and available. It reflects how reliable the system is over a defined period and is typically expressed as a percentage of total time that the system remains up, with downtime reducing that percentage. This is about availability over time, not about how much work is done (throughput), how much data can be stored (storage capacity), or how many users can connect at once (concurrent users). So the statement that uptime corresponds to the fraction of time the system is up best captures what uptime measures.

Uptime is the proportion of time a system is operational and available. It reflects how reliable the system is over a defined period and is typically expressed as a percentage of total time that the system remains up, with downtime reducing that percentage. This is about availability over time, not about how much work is done (throughput), how much data can be stored (storage capacity), or how many users can connect at once (concurrent users). So the statement that uptime corresponds to the fraction of time the system is up best captures what uptime measures.