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在使用两台计算机同步并联运行,以提高其可靠性的计算机系统中,当一台计算机发生故障时,可以切换故障机用正常计算机继续运行。但是,在高速进行实时处理的计算机系统中,由于正常计算机的储存内容在不断变更。因此要使修理好故障的计算机重新投入并联运行,则必须在并联动作的准备阶段,更新修理完故障计算机的存储内容,使其符合正常计算机的存储内容,这样、动态地保持了两台计算机的存储内容的一致性。
In a computer system that uses two computers to run in parallel to improve their reliability, when one computer fails, the failed computer can be switched on with a normal computer to continue running. However, in a computer system that performs real-time processing at a high speed, storage contents of the normal computer constantly change. Therefore, in order to put the repaired computer back into parallel operation, it is necessary to update the stored contents of the repaired computer so that it meets the storage requirements of the normal computer in the preparation phase of the parallel operation. In this way, the two computers Store content consistency.