31. RAID Level 3

• Raid Level 3 requires at least three disks and have a dedicated parity disk

• The parity disk

  • recognizes errors in the other two disks

  • will be used to recreate the contents of a data disk in case if it fails

• For example, if you have two values: 3 and 4, when they are added, the parity is 7.

  Since it is unlikely that both data disks will fail simultaneously, either value can be recovered using known paritty.