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RAID 1 configuration

RAID 1 writes all data to two or more drives for 100% redundancy: if either drive fails, no data is lost. Compared to a single drive, RAID level 1 tends to be faster on reads, slower on writes. This is a good entry-level redundant configuration. However, since an entire drive is a duplicate, the cost per megabyte is high. This is commonly referred to as mirroring.

Minimum number of drives required: 2

Performance: Average

Redundancy: High

Efficiency: Low


  • Fault tolerant
  • Easy to recover data in case of drive failure
  • Easy to implement


  • Highly inefficient (100% parity overhead)
  • Not scalable (becomes very costly as number of disks increase)

RAID 0 ¦ RAID 1 ¦ RAID 0+1 ¦ RAID 10 ¦ RAID 5 ¦ RAID 6 ¦ RAID 50 ¦ RAID 60