CONTROL AND SAFETY OF THE DUPLICATED COMPUTER SYSTEMS

• Published in: Nauchno-tekhnicheskiĭ vestnik informat͡s︡ionnykh tekhnologiĭ, mekhaniki i optiki Vol. 17; no. 2; p. 368
• Main Authors: Bogatyrev, V A, Vinokurova, M S, Petrov, P A, Nazarova, M L, Shabakov, R V
• Format: Journal Article
• Language: Russian
• Published: Saint Petersburg St. Petersburg National Research University of Information Technologies, Mechanics and Optics 01.03.2017
• Subjects: Downtime; Markov chains; Periodic variations; Reproduction (copying); Safety
• ISSN: 2226-1494; 2500-0373
• DOI: 10.17586/2226-1494-2017-17-2-368-372

Subject of Research.The paper deals with duplicated computer system. Each node contains operational and test control. To improve the readiness of the system to implement the required functions, the test transition mode is valid only for one computer node. In addition to the functional and failed states of the system there are possible dangerous conditions not detected by the control malfunction of the nodes. The aim of this work is to define testing initialization optimal intervals that ensure the maximum probability of the system readiness for safety implementation of functional requests while minimizing downtime and delays in service. Method. Research method is based on creating a Markov model that gives the possibility to determine the probability of the system states and the impact of discipline and test control frequency initialization on the readiness of the system for safety operation. Main Results. We have shown the existence of optimal periodicity of test control, the one that produces the maximum probability of the system readiness for safety servicing of requests with delay minimizing of their stay in the system. Practical Relevance. The proposed models can be used in the selection of control disciplines and recovery of the safety operation of computer systems.