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Raid Types


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Raid Types

  2. 2. What are RAIDS • RAID is an acronym meaning, Redundant Array of Inexpensive Disks. It’s another way to allow computer data storage. • There are different levels of RAIDs, arranged so that they are faster to write to and read from than a single disk. • RAID is not a good alternative to backing up data, it may become damaged or erase without you even knowing.
  3. 3. Types of RAIDS • RAID 0 is simply data striped over several disks. This gives a performance advantage, as it is possible to read parts of a file in parallel. However not only is there no data protection, it is actually less reliable than a single disk, as all the data is lost if a single disk in the array stripe fails. RAID1 is data mirroring. Two copies of the data are held on two physical disks, and the data is always identical. RAID1 has a performance advantage, as reads can come from either disk, and is simple to implement. However, it is expensive, as twice as many disks are needed to store the data. RAID4 data is written in blocks onto the data disks (i.e. not striped), then parity is generated and written to a dedicated parity disk.