冗余系統(tǒng)（redundant system）是指為增加系統(tǒng)的可靠性，而采取兩套或兩套以上相同、相對獨立配置的設計連接組成的系統(tǒng)。磁盤雙聯(lián)：為鏡像磁盤增加了一個I/O控制器,就形成了磁盤雙聯(lián),使總線爭用情況得到改善;RAID：冗余磁盤陣列(Redundant array of inexpensive disks)的縮寫。顧名思義，它由幾個磁盤組成,通過一個控制器協(xié)調運動機制使單個數據流依次寫入這幾個磁盤中。RAID3系統(tǒng)由5個磁盤構成,其中4個磁盤存儲數據，1個磁盤存儲校驗信息。如果一個磁盤發(fā)生故障，可以在線更換故障盤，并通過另3個磁盤和校驗盤重新創(chuàng)建新盤上的數據。RAID5將校驗信息分布在5個磁盤上，這樣可更換任一磁盤，其余與RAID3相同。


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