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Introduction to RAID

Jan 06, 2011, 17:31 (0 Talkback[s])
(Other stories by Jeffrey B. Layton)

[ Thanks to bryanjrichard for this link. ]

"One of the most common techniques to improve either data reliability or data performance (or both) is called RAID (Redundant Array of Inexpensive Disks). The concept was developed in 1977 by David Patterson, Garth Gibson, and Randy Katz as a way to use several inexpensive disks to create a single disk from the perspective of the OS while also achieving enhanced reliability or performance or both.

"Before anyone erupts and says that RAID does not stand for "Redundant Array of Inexpensive Disks", let me start by stating that was the original definition. Over time, the definition has become more commonly known as "Redundant Array of Independent Disks" perhaps so the word "inexpensive" isn't associated with RAID controllers or disks. Personally I use the original definition but regardless, either definition means that the disks are independent of one another. Feel free to use either definition since it won't change the content of this article. Now, back to our discussion of RAID."

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