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What is RAID? What is RAID0, RAID1, RAID5, RAID6, RAID10?
in Computer Science by Diamond (51,000 points) | 10 views

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A RAID (Redundant Array of Inexpensive Disks) is a technology that is used to increase the performance and/or reliability of data storage.

  • RAID0: Also known as disk striping, is a technique that breaks up a file and spreads the data across all the disk drives in a RAID group. There are no safeguards against failure
  • RAID1: A popular disk subsystem that increases safety by writing the same data on two drives. Called "mirroring," RAID 1 does not increase write performance, but read performance may equal up to the sum of each disks' performance. However, if one drive fails, the second drive is used, and the failed drive is manually replaced. After replacement, the RAID controller duplicates the contents of the working drive onto the new one
  • RAID5: It is disk subsystem that increases safety by computing parity data and increasing speed by interleaving data across three or more drives (striping). Upon failure of a single drive, subsequent reads can be calculated from the distributed parity such that no data is lost
  • RAID6: RAID 6 extends RAID 5 by adding another parity block. It requires a minimum of four disks and can continue to execute read and write of any two concurrent disk failures. RAID 6 does not have a performance penalty for read operations, but it does have a performance penalty on write operations because of the overhead associated with parity calculations
  • RAID10: Also known as RAID 1+0, is a RAID configuration that combines disk mirroring and disk striping to protect data. It requires a minimum of four disks, and stripes data across mirrored pairs. As long as one disk in each mirrored pair is functional, data can be retrieved. If two disks in the same mirrored pair fail, all data will be lost because there is no parity in the striped sets
by Diamond (51,000 points)

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