Uptime is a measure of reliability or efficiency that expresses either the duration of uninterrupted system availability in time units, or the percentage of total time for which there was uninterrupted system availability. In computing, both hardware platforms or software systems will be described in terms of the time when the system is available to customers as a percentage of the total time. Many service level agreements will specify uptime, e.g. 99.9% uptime. (NB this refers to total time, not uninterrupted time.) The opposite of uptime is downtime, which may occur for scheduled maintenance or for unscheduled system failures. See also Contract, Performance Based and Service Level Agreement.

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Discover the world’s largest Glossary of Procurement terms

With over 800 Procurement specific terms (and growing) you will find everything you need to know or thought you knew about the Procurement function. Our aim is to provide you with a comprehensive list collated from the Comprara Groups hub of training and consulting source materials.The Procurement Glossary has been compiled by industry expert Paul Rogers.