The formula most commonly used to calculate uptime is the following: Availability (%) = Uptime/Total Time. Great spreadsheet! So in basis, if the failure of one component leads to the the combination being unavailable, then it's considered a serial connection. To accurately measure system availability, you must monitor all components for outages, then calculate end-to-end availability. Monthly availability = 100% x (730 – 8) / 730 = 98.9%; Quarterly availability = 100% x (2190 – 8) / 2190 = 99.6%; Each of these is a valid figure for the availability of the service, but only one of them shows that the target was met. Uptime is the amount of time that a service is online available and operational. Here's a step-by-step guide to these availability calculations. One Response to "System Uptime / Availability Calculator Template" By Tim June 22, 2015 - 7:53 AM. And finally If the failure of one component leads to… System Availability Calculator System failures are a serious issue that all companies should examine due to the related and considerable costs that result. Availability is the percentage of time, in a specific time interval, during which a server, cloud service, or other machine can be used for the purpose that it was originally designed and built for. "High availability" refers to the processes involved in maximising this availability. Calculate availability of machinery as one component of overall machinery productivity performance. Continuing the example above, if one can replace the hard disk and motherboard within 2 and 5 hours respectively, then one can expect on average a system availability of 99.98% which corresponds to a downtime of around 1 hour 45 minutes per year. System Availability System Availability is calculated by the interconnection of all its parts. Weekly availability = 100% x (168 – 8) / 168 = 95.2%. Availability is an important metric used to assess the performance of repairable systems, accounting for both the reliability and maintainability properties of a component or system. Populate the system RBD with the best available data and look for areas that still need data or improved data (if the uncertainty and impact on results are large). SLA Uptime Calculator: How much downtime is 99.9%. Did you know, though, that there are different classifications of availability and different ways to calculate it? These parts can be connected in serial ("dependency") or in parallel ("clustering"). System availability goals are high for system which provide value and have to do so regularly often with little or no interruption. Guaranteed uptime is expressed as SLA level and is generally the most important metric to measure the quality of a hosting provider. Establish the total available hours for the machine. Where. Availability. Estimate the cost or impact of downtime. I am looking for a template to calculate my system availability, downtime per year, downtime per month for for systems. SLA level of 99.999 % uptime/availability results in the following periods of allowed downtime/unavailability: . Daily: 0s Weekly: 6s Monthly: 26s Quarterly: 1m 18s Yearly: 5m 15s Direct link to page with these results: uptime.is/99.999 (or uptime.is/five-nines) This can be represented by the total number of hours the machinery can be used in a day or shift-- normally 8, 10 or 12 hours. Use this tool to calculate the key metrics for system availability in order to evaluate current system capabilities, identify vulnerable areas, and improve overall reliability. BQR offers free calculators for Reliability and Maintainability, including: MTBF, failure rate, confidence level, reliability and spare parts ( % ) = Uptime/Total time in the following periods of allowed downtime/unavailability: ways to calculate my system is... 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