What Is Raid

Topics: RAID, Standard RAID levels, Parity bit Pages: 4 (1337 words) Published: October 22, 2010
What is RAID?
Although also a bug-killing insecticide, RAID in dedicated server hosting terms stands for Redundant Arrays of Inexpensive Disks (also known as Redundant Arrays of Inexpensive Drives or Redundant Arrays of Independent Disks/Drives) and is an important aspect of your dedicated server hosting plan. Especially if you are running a large, data-driven website that requires a larger disk or hard drive storage space than normal, you can use RAID technology to combine multiple hard drives to increase the amount of available storage space for your pictures, videos, music, files, documents, and more. RAID is also said to increase the redundancy and reliability of your server, offering better general performance of your servers and bigger hard drive volume through collection. There are Standard RAID Levels (from 0 to 6) which can accomplish the RAID in alternative methods, and there are also Nested and Non-Standard Levels. RAID can be software or hardware based and is normally split between three major concepts called mirroring, striping, and error correction. RAID 0: Striped Set (2 disks minimum) without parity. Provides improved performance and additional storage but no fault tolerance from disk errors or disk failure. Any disk failure destroys the array, which becomes more likely with more disks in the array. The reason a single disk failure destroys the entire array is because when data is written to a RAID 0 drive, the data is broken into "fragments". The number of fragments is dictated by the number of disks in the drive. Each of these fragments are written to their respective disks simultaneously on the same sector. This allows smaller sections of the entire chunk of data to be read off the drive in parallel, giving this type of arrangement huge bandwidth. When one sector on one of the disks fails, however, the corresponding sector on every other disk is rendered useless because part of the data is now corrupted. RAID 0 does not implement error...
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