9.3. Disk System Fault Tolerance

A hard disk is a temporary storage device, and every hard disk will eventually fail. The most common problem is a complete hard-disk failure (also known as a hard-disk crash). When this happens, all stored data is irretrievable. Therefore, if you want your data to be accessible 90 to 100 percent of the time (as with warm and hot sites), you need to use some method of disk fault tolerance. Typically, disk fault tolerance is achieved through disk management technologies such as mirroring, striping, and duplexing drives and provides some level of data protection. As with other methods of fault tolerance, disk fault tolerance means that a disk system is able to recover from an error condition of some kind.

The following ...

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