The Need for RAID
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The need for RAID can be summarized in two points given below. The two keywords are Redundant and Array.

Provided that the RAID hardware and software perform true parallel accesses on multiple drives, there will be a performance improvement over a single disk.

With a single hard disk, you cannot protect yourself against the costs of a disk failure, the time required to obtain and install a replacement disk, reinstall the operating system, restore files from backup tapes, and repeat all the data entry performed since the last backup was made.

With multiple disks and a suitable redundancy scheme, your system can stay up and running when a disk fails, and even while the replacement disk is being installed and its data restored.

To create an optimal cost-effective RAID configuration, we need to simultaneously achieve the following goals: