What is RAID, why do you need it, and what are all those mode numbers that are constantly bandied about? RAID stands for "Redundant Array of Independent Disks" or "Redundant Array of Inexpensive Disks," depending on who you talk to. Note that the word array is included in the acronym, so saying "RAID array," as a lot of people do, is redundant.
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Back when hard drives were less capacious and more expensive, RAID was created to combine multiple, less-expensive drives into a single, higher-capacity and/or faster volume. On top of that, it was designed to facilitate redundancy, also known as fault tolerance or failover protection, so that the array and its data remain usable when a drive fails. You'll often hear about 1-disk or 2-disk redundancy, which refers to the number of drives that can fail while the array remains viable. Read More
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Back when hard drives were less capacious and more expensive, RAID was created to combine multiple, less-expensive drives into a single, higher-capacity and/or faster volume. On top of that, it was designed to facilitate redundancy, also known as fault tolerance or failover protection, so that the array and its data remain usable when a drive fails. You'll often hear about 1-disk or 2-disk redundancy, which refers to the number of drives that can fail while the array remains viable. Read More
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