Abstract
The paper describes modern technologies of Computer Network Reliability. Software tool is developed to estimate of the CCN critical failure probability (construction of a criticality matrix) by results of the FME(C)A-technique. The internal information factors, such as collisions and congestion of switchboards, routers and servers, influence on a network reliability and safety (besides of hardware and software reliability and external extreme factors). The means and features of Failures Modes and Effects (Critical) Analysis (FME(C)A) for reliability and criticality analysis of corporate computer networks (CCN) are considered. The examples of FME(C)A-Technique for structured cable system (SCS) is given. We also discuss measures that can be used for criticality analysis and possible means of criticality reduction. Finally, we describe a technique and basic principles of dependable development and deployment of computer networks that are based on results of FMECA analysis and procedures of optimization choice of means for fault-tolerance ensuring.
Highlights
Lots of formalized dependability assessment techniques based on failure criticality analysis (FME(C)A), construction of the event and fault tree (FTA), emergency situation analysis (HAZOP) [1,2], etc. has been developed during the last decade
The classification of failure modes, causes, effects and means of safety and fault-tolerance ensuring for the network functional elements is obtained by using the FME(C)A-format
The various means of safety and faulttolerance ensuring of the network hardware and software are indicated in the last table column
Summary
Lots of formalized dependability assessment techniques based on failure criticality analysis (FME(C)A), construction of the event and fault tree (FTA), emergency situation analysis (HAZOP) [1,2], etc. has been developed during the last decade. The purpose of FME(C)A-technique is specification of modes, sources and critical failure effects, including multiple and dependent failures, assessment of methods and different means CCN fault-tolerance and safety ensuring. The probability and the severity for each failure mode of specified computer network are determined on the basis of statistical information or expert estimations It allows to construct a criticality grid, and with its help to execute a qualitative analysis of CCN reliability, to determine a set of the most critical failures and means for their recovery.
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