Результаты поиска по 'software defined networks':
Найдено статей: 2
  1. Stepin Y.P., Leonov D.G., Papilina T.M., Stepankina O.A.
    System modeling, risks evaluation and optimization of a distributed computer system
    Computer Research and Modeling, 2020, v. 12, no. 6, pp. 1349-1359

    The article deals with the problem of a distributed system operation reliability. The system core is an open integration platform that provides interaction of varied software for modeling gas transportation. Some of them provide an access through thin clients on the cloud technology “software as a service”. Mathematical models of operation, transmission and computing are to ensure the operation of an automated dispatching system for oil and gas transportation. The paper presents a system solution based on the theory of Markov random processes and considers the stable operation stage. The stationary operation mode of the Markov chain with continuous time and discrete states is described by a system of Chapman–Kolmogorov equations with respect to the average numbers (mathematical expectations) of the objects in certain states. The objects of research are both system elements that are present in a large number – thin clients and computing modules, and individual ones – a server, a network manager (message broker). Together, they are interacting Markov random processes. The interaction is determined by the fact that the transition probabilities in one group of elements depend on the average numbers of other elements groups.

    The authors propose a multi-criteria dispersion model of risk assessment for such systems (both in the broad and narrow sense, in accordance with the IEC standard). The risk is the standard deviation of estimated object parameter from its average value. The dispersion risk model makes possible to define optimality criteria and whole system functioning risks. In particular, for a thin client, the following is calculated: the loss profit risk, the total risk of losses due to non-productive element states, and the total risk of all system states losses.

    Finally the paper proposes compromise schemes for solving the multi-criteria problem of choosing the optimal operation strategy based on the selected set of compromise criteria.

    Keywords: multicriteria assessment, risk, exploitation strategy, medium dynamics, Markov chain stationary mode, cloud technology, open integration platform.
  2. Petrosyan A.Sh.
    The New Use of Network Element in ATLAS Workload Management System
    Computer Research and Modeling, 2015, v. 7, no. 6, pp. 1343-1349

    A crucial component of distributed computing systems is network infrastructure. While networking forms the backbone of such systems, it is often the invisible partner to storage and computing resources. We propose to integrate Network Elements directly into distributed systems through the workload management layer. There are many reasons for this approach. As the complexity and demand for distributed systems grow, it is important to use existing infrastructure efficiently. For example, one could use network performance measurements in the decision making mechanisms of workload management systems. New advanced technologies allow one to programmatically define network configuration, for example SDN — Software Defined Networks. We will describe how these methods are being used within the PanDA workload management system of the ATLAS collaboration.

    Keywords: ATLAS, PanDA, distributed computing, workload management system, decision making mechanisms, network, network performance measurements, software defined networks.
    Views (last year): 2. Citations: 2 (RSCI).

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