This paper introduces the structure of dual controllers of theRAID system and makes a comparison and analysis of two methods to implementation of dual controllers. It also proposes solutions to the problems in their implementation such as error detection, failover and mirrored cache%本文介绍了RAID子系统中双控制器的结构，比较和分析了能够实现双控制器的两个方案，并针对通常的双控制器实现方案中存在的故障检测、故障处理和cache镜象等问题提出了相应的解决方案。
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