Application of Petri Networks for Support of Functional Stability of Information Systems

In this paper under the functional stability of the information system is understood the property of the system to be in the able state to work, that is, to perform the necessary functions within the given interval of time or works in the conditions of refusals of component parts through external and internal factors. Indicators of functional stability characterize the result of its provision by redistributing of existing redundancy or resources in extraordinary situations. The conducted analysis of Petri Networks lets conclude, that maintaining the functional stability of the information system under the influence of external and internal destabilizing factors is a complex of dynamic process which can be described by Petri Network. In this manner, with using of Petri Networks it is possible to create models, which let save the functional stability of the information system under the influence of external and internal destabilizing factors, which based on the description of the structure of the information system. Such models allow taking into account both the features of the construction of the information system and the dynamics of processes the dynamics of processes of changing its states by functioning under conditions of influence of external and internal destabilizing factors.