Chapter 4: Technology Background
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drive. In this example, physical drive 3 failed and the array is rebuilt using
physical drive 6, the revertible spare drive.
When the rebuild is complete, the spare drive has replaced the failed drive. In this
example, failed drive 3 was replaced by spare drive 6. The disk array now
consists of physical drives 1, 2, 4, and 6.
There is no spare drive at this moment. Even if physical drive 5 is of adequate
capacity, it has not been designated as a spare, therefore the controller cannot
use it as a spare.
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