Why do servers need disk arrays? What are the benefits

When renting a server, you will often see the hard disk raid. raid is a redundant disk array, multiple hard disk drives in accordance with certain requirements so that the entire array is managed by the array controller to form a storage system. The initial development purpose is to use multiple cheap small disks to replace expensive large disks, in order to reduce costs. With the development of hard disk technology, today's disk arrays use redundant information in a way that makes it possible to protect data.

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Provide fault tolerance

Ordinary disk drives are not able to provide fault tolerance, and disk arrays can provide fault tolerance through data verification, the server will write data to multiple disks, if a disk failure, at this time can still ensure the availability of information, important data will not be lost, and there will be no delay in the normal operation of the server.

Improve the transfer rate

Disk array will be more than one disk to form an array, as a single disk to use the data has been stored in the form of segments to the different hard disk, data access changes, the array of the relevant disks to work together, which can significantly reduce the time of the data storage, but also has a better space and utilization.

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