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 andslower 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 onlytwo drives are required; however, since one drive is used to store aduplicate of the data, the cost per megabyte is high. This level iscommonly 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