Abstract
AbstractFor a switching system which must operate 24 hours a day with high reliability, the requirements are secure recovery from a fault and minimization of the effect of the fault recovery (i.e., system down time). On the other hand, when a multiprocessor system is employed, competition may be produced among processors, leading to complex and difficult problems in the fault recovery. Several techniques are shown in this paper concerning the following points: (1) local fault processing in the unit processor; (2) the upper‐level fault processing, realized by combining the local fault processing; and (3) improvement of reliability of the fault recovery by a hierarchical monitoring of the overall system. With regard to the effect of the fault recovery, the factors affecting the down time are analyzed. The relations among those factors, the performance of the processor, and the fault rate are modeled. The effect of the fault recovery is compared between the proposed system and the existing single‐processor control system. As the result of comparison, it is shown that the proposed multiprocessor control system can localize the effect of the fault, and is more desirable than the traditional single‐processor control system.
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