RAID Setup

I want to know about RAID setup.Do we need multiple hard disks for RAID? How can we setup hard disks in RAID?Does it offer better performance?What are pros &cons?
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More about raid setup
  1. Yes, you must have multiple disks for RAID - Redundant Array of Inexpensive Disks.

    There are numerous posts discussing the benefits of RAID and the various configurations (RAID 0, 5, 6, 10). The Redundancy and performance are the benefits, but you sacrifice disk space to the parity information or the striping, based on which configuration.
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