RAID 6

RAID 6 configuration

RAID 6 is an upgrade from RAID 5: data is striped at a block level across several drives with double parity distributed among the drives. As in RAID 5, parity information allows recovery from the failure of any single drive. The double parity provides additional redundancy at the cost of lower write performance (read performance is the same), and redundancy overhead remains low.

RAID 6

Minimum number of drives required: 4

Performance: Average

Redundancy: High

Efficiency: High

Advantages:

  • Fault tolerant – increased redundancy over RAID 5
  • High efficiency
  • Remains a great option in multi-user environments which are not write performance sensitive

Disadvantages:

  • Write performance penalty over RAID 5
  • More expensive than RAID 5
  • Disk failure has a medium impact on throughput
  • Complex controller design

Providing double data protection against drive failure protects systems now 12TB hard disks are available and rebuild times would take a considerable time.

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

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