Patent ID: 7752493
Filing Date: 2010-07-06
Classification: G06F

Abstract:
1. A high reliability system in which a plurality of apparatuses are mutually connected through an internal network, apparatus pairs are constructed with respect to said plurality of apparatuses, and spare apparatuses are allocated, thereby giving redundancy, comprising: said plurality of apparatuses respectively including: wherein said synchronization processing unit manages a management table in which pair numbers showing the pairs in correspondence to apparatus numbers have been stored, recognizes the apparatus having the same pair number as that of the self apparatus in said management table as a pair partner apparatus, and executes the synchronizing process, wherein said synchronization processing unit stores a hub number of a hub connected to the external network, a spare flag showing the spare apparatus, and a failure flag showing a failed apparatus into said management table in addition to the pair numbers corresponding to the apparatus numbers, and when the pair applications are received from a plurality of processing apparatuses, said fault processing unit selects a new pair partner apparatus based on the pair number and the hub number in said management table and reconstructs the apparatus pair, wherein when the pair applications are received from a plurality of apparatuses, said fault processing unit sequentially applies the following five rules and determines and reconstructs the pair partner apparatus: a first rule by which the apparatus having the different hub number and the same pair number as those of the pair apparatus and having the same hub number and the same pair number as those of the apparatus which has been the latest pair is set to the pair partner apparatus; a second rule by which the apparatus having the different hub number and the same pair number is set to the pair partner apparatus; a third rule by which the apparatus having the different hub number and the different pair number as those of the pair apparatus and having the same hub number and the same pair number as those of the apparatus which has been the latest pair is set to the pair partner apparatus; a fourth rule by which the apparatus having the different hub number and the different pair number is set to the pair partner apparatus; and a fifth rule by which the apparatus having the same hub number and the different pair number is set to the pair partner apparatus.