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RAID controller

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The RAID controller is best described as a device in which servers and storage intersect. The controller can be internal to the server, in which case it is a card or chip, or external, in which case it is an independent enclosure, such as a NAS (network-attached storage). In either case, the RAID controller manages the physical storage units in a RAID system and delivers them to the server in logical units (e.g., six physical disks may be used to ensure that one drive stays correctly backed up, but the server sees only one drive).

While a RAID controller is almost never purchased separately from the RAID itself, the controller is a vital piece of the puzzle and therefore not as much a commodity purchase as the array.

A RAID (Redundant_array_of_independent (or inexpensive)_disks) system is simply a collection of disk drives that employs two or more drives in combination for fault tolerance and performance. RAID drives vary in robustness from Level 0 (data striping without redundancy) to Level 5 (data striping at the byte level with stripe error correction information).


References

Storage Basics: Choosing a RAID Controller, May 7, 2004, By Ben Freeman[1]

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