What is RAID?
RAID (Redundant Array of Independent Disks, formerly Redundant Array of Inexpensive Disks) provides a way of storing the same data in different places–thus, redundantly–on multiple hard disks, although not all RAID levels provide redundancy.
By placing data on multiple disks, input/output (I/O) operations can overlap in a balanced way, improving performance. Since multiple disks increase the mean time between failures (MTBF), storing data redundantly also increases fault tolerance.
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