Availability model based on network calculus for data flow processing system

The work examines the problem of assessing accessibility in digital computing systems focused on flow data processing, Availability is considered in the context of the confidentiality, integrity, availability (CIA) model of information security, Availability is characterized by the fact that it is a “point” assessment of the time characteristics of a system, its function or element, To assess availability, a three-level reference model is proposed, associated with different representations of the system at the architectural and functional levels, The formulation of the model is considered within the framework of the network calculus theory (NC), which makes it possible to apply this model to calculate the accessibility of digital computing systems in practice, To test the model, the work analyzes the availability of the system on a mock-up of a digital computing system with competitive processing of streaming data on the server, The possibility of calculating system parameters for various disciplines of processing competing threads on the server is shown.