RAID (originally redundant array of inexpensive disks, now commonly redundant array of independent disks) is a data storage virtualization technology that combines multiple physical disk drive components into a single logical unit for the purposes of data redundancy, performance improvement, or both.

A number of different levels and schemas have evolved time after time.

Here you have a table repotrting, for every different level, the global capacity and realiability.


Characteristics of most common RAID levels
LevelMin disk numberGlobal Capacity

Max number
of defecting disk(s)

Schema
RAID 0 2 C × N 0 RAID Level 0
RAID 1 2 C N - 1 RAID Level 1
RAID 3 3 C × (N - 1) 1 RAID Level 3
RAID 4 3 C × (N - 1) 1 RAID Level 4
RAID 5 3 C × (N − 1) 1 RAID Level 5
RAID 6 4 C × (N − 2) 2 RAID Level 6
C = capacity of littlest disk; N = number of disks 

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  • RAID, storage
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