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Warm standby in hierarchically structured process-control programs

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2 Author(s)
Ing-Ray Chen ; Inst. of Inf. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Bastani, F.B.

We classify standby redundancy design space in process-control programs into the following three categories: cold standby, warm standby, and hot standby. Design parameters of warm standby are identified and the reliability of a system using warm standby is evaluated and compared with that of hot standby. Our analysis indicates that the warm standby scheme is particularly suitable for long-lived unmaintainable systems, especially those operating in harsh environments where burst hardware failures are possible. The feasibility of warm standby is demonstrated with a simulated chemical batch reactor system

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Software Engineering, IEEE Transactions on  (Volume:20 ,  Issue: 8 )