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Data A&E - RAID 1 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 at reading but slower at writing compared to a single drive, however, if either drive fails then 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 duplication of the data, the cost per megabyte is high. This level is referred to as mirroring.

Advantages

  • - No parity generated
  • - Implementation is easy
  • - Uses the full disk capacity
  • - minimum two drives required

Disadvantages

  • - Disk space use id very efficient
  • - Disk overhead is high
  • - Number of writes is doubled

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