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
• In efficient use of disk space.
• High disk overhead.
• Doubles number of writes.
Application
• Pre-Press, Video editing and production, image manipulation/editing.
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