如果他们阵列的任何组件出问题了，整个阵列出现故障。md0，从另一方面上，是镜像，并有冗余，在健康状态，所用的设备表现出来。
If any of the components of their arrays goes bad, the arrays will fail. md0, on the other hand, is a mirror, and has redundancy, which is manifested in the status of healthy, used devices.
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