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|Redundant Array of Independent Disks - RAID|
The abbreviation of RAID is “Redundant Array of Independent Disks”, a disk drives which uses more than one drives in combination for fault tolerance. RAID disk drives are used on servers but generally it is used for personal computers. There are different types of RAID levels:
RAID O: RAID 0 is used for striping techniques for setting up disk arrays. It is sometimes used to describe a collection of disks. RAID 0 can be called as AID, as it involves no redundancy. In RAID O drives files are broken into stripes of a size defined by the user, and stripes are used to send in a disk of array. The redundancy allows this RAID level for best performance characteristics of the single RAID levels.
RAID 1: RAID 1 is generally used in implemented as mirroring; a drive which has its data duplicate copies in two different drives if either one of the drive fails, the other drive continues to function as a single drive until the failed drive is replaced. RAID 1 is popular for those who require fault tolerance and don't need top-notch.
RAID 3: In RAID 3 data is striped at byte level; the number of bytes sent in each stripe varies. The information is sent to a parity disk, the failure of any disk in the array can be tolerated and the dedicated parity disk generally serve as a performance bottleneck and allows for random writes, because it must be accessed any time anything is sent to the array.
RAID 5: The most popular RAID levels are the RAID 5 which stripes out both data and parity information across three or more drives. It helps in removing the bottleneck that the dedicated parity drive represents, and improves, the write performance by allowing better parallelism. Fault tolerance is can be ensured through the parity information of any given block of data
RAID 6: RAID 6 is some what similar to the RAID 5, but it stripes blocks of data and parity across an array of drives like RAID 5, except that it calculates two sets of parity information for each parcel of data. The main goal of RAID 6 is to improve fault tolerance; RAID 6 is smarter enough to handle the failure which occurs in any of the two drives. RAID 6 is some what worse than RAID 5 in terms.
RAID 0 5 and RAID 5 0: RAID 0 5 and 5 0 are arrays which combines the property of RAID 0 and RAID 5. RAID 05 is a RAID 5 array along with striped RAID 0 arrays; it is very less used when compared to RAID 50. RAID 50 and 05 helps in improves the performance of RAID 5 through the addition of the properties of RAID 0.
RAID 0 3 and RAID 3 0: RAID 0 3 and 3 0 combines various factors such as byte striping, parity and block striping to create large arrays. RAID 3 0 is easily available and is formed by striping across a number of RAID 3 sub-arrays.
RAID 0 1 and RAID 1 0: RAID 0 1 and 1 0 combines the excellent features of striping and mirroring to get large arrays with high performance. RAID 0 1 is a mirrored configuration where as RAID 1 0, a stripe across a number of mirrored sets. RAID 1 0 and 01 is used increasing because its hard disks are cheaper. Both RAID 0 1 and 10 types provide very good performance by combining the features such as speed of RAID 0 with the redundancy of RAID 1.
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