四川施耐德电源140CPS21100

冗余系统（redundant system）是指为增加系统的可靠性，而采取两套或两套以上相同、相对独立配置的设计连接组成的系统。磁盘双联：为镜像磁盘增加了一个I/O控制器,就形成了磁盘双联,使总线争用情况得到改善;RAID：冗余磁盘阵列(Redundant array of inexpensive disks)的缩写。顾名思义，它由几个磁盘组成,通过一个控制器协调运动机制使单个数据流依次写入这几个磁盘中。RAID3系统由5个磁盘构成,其中4个磁盘存储数据，1个磁盘存储校验信息。如果一个磁盘发生故障，可以在线更换故障盘，并通过另3个磁盘和校验盘重新创建新盘上的数据。RAID5将校验信息分布在5个磁盘上，这样可更换任一磁盘，其余与RAID3相同。


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