16 lines
914 B
Markdown
16 lines
914 B
Markdown
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title = "What is RAID?"
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description = "RAID stands for 'Redundant Array of [Independent/Inexpensive] Disks'"
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weight = 1
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type = "post"
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class="post first"
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It is a common technique to provide **resiliency** and **availability** to a set of data and protect against one of the most common data loss scenarios: the failure of a disk.
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The simplest type of RAID is a 'mirror', which does just what it sounds like: keeps two (or more) copies of data on two (or more) different disks. If one disk fails, the second copy is still available and no data loss has occurred.
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There also exist more advanced modes, the most common of which is called RAID-5, and consists of 3 or more disks with data stripped (written sequentially) across the disks.
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The [Wikipedia page for RAID](http://en.wikipedia.org/wiki/RAID) provides some helpful information about the history and bennefits of the various RAID implementations.
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