System Availability and Reliability

Flashcards covering key concepts related to system availability, reliability, and maintainability.

Availability

The probability that a repairable system is operational at a given point in time.

Total Uptime

The time during which a system is operational.

Total Downtime

The time during which a system is not operational, can be planned or unplanned.

Maintainability

The ease with which a system can be maintained and repaired.

Serviceability

How easy something is to service, including planned maintenance.

Mean Time to Repair (MTTR)

The average time required to repair a system after a failure, calculated as number of failures multiplied by repair time.

Reliability

The probability of a system performing its required function or action.

Failure Probability

The likelihood that a system will fail.

Fault Tree Analysis

A systematic approach to identify potential failures and their probabilities, using AND and OR gates.

AND Gates (in Fault Tree Analysis)

Indicates that all events must fail for a failure to occur.

OR Gates (in Fault Tree Analysis)

Indicates that if either event fails, a failure will result.

Redundancy

The inclusion of extra components that are not strictly necessary to functioning, used to increase reliability.

Robust Design

A design that remains effective under a range of conditions, enhancing reliability.