The Reliability Analysis of the 1-out-of-2 System in Which Two Modules Do Mutual Cooperation in Recovery Mode

Aromhack SAYSANASONGKHAM  Satoshi FUKUMOTO  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E99-A   No.9   pp.1730-1734
Publication Date: 2016/09/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E99.A.1730
Type of Manuscript: LETTER
Category: Reliability, Maintainability and Safety Analysis
Keyword: 
1-out-of-2 system,  reliability analysis,  Markov chain,  unreliability,  parallel redundant system,  hardware restoration,  data reconstruction,  mutual cooperation,  FPGA,  reconfiguration,  

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Summary: 
In this research, we investigated the reliability of a 1-out-of-2 system with two-stage repair comprising hardware restoration and data reconstruction modes. Hardware restoration is normally independently executed by two modules. In contrast, we assumed that one of the modules could omit data reconstruction by replicating the data from the module during normal operation. In this 1-out-of-2 system, the two modules mutually cooperated in the recovery mode. As a first step, an evaluation model using Markov chains was constructed to derive a reliability measure: “unavailability in steady state.” Numerical examples confirmed that the reliability of the system was improved by the use of two cooperating modules. As the data reconstruction time increased, the gains in terms of system reliability also increased.