Raid Levels explained

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RAID 1

Provides redundancy by writing all data to two or more drives. The performance of a level 1 array tends to be faster on reads and slower on writes compared to a single drive, but if either drive fails, no data is lost. This is a good entry-level redundant system, since only two drives are required; however, since one drive is used to store a duplicate of the data, the cost per megabyte is high. This level is commonly referred to as mirroring.


Advantages

  • No parity generation
  • Easy to implement
  • Extremely fault tolerant
  • Utilises full disk capacity
  • 2 drives minimum

Disadvantages

  • Inefficient use of disk space
  • High disk overhead
  • Doubles number of writes

Applications

  • Pre-Press
  • Video editing and production
  • Image manipulation/editing