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RAID 6

RAID6

Characteristics/Advantages

RAID 6 is essentially an extension of RAID level 5 which allows for additional fault tolerance by using a second independent distributed parity scheme (dual parity).

Data is striped on a block level across a set of drives, just like in RAID 5, and a second set of parity is calculated and written across all the drives; RAID 6 provides for an extremely high data fault tolerance and can sustain multiple simultaneous drive failures.

Perfect solution for mission critical applications.

Disadvantages

More complex controller design. Controller overhead to compute parity addresses is extremely high.

Write performance can be brought on par with RAID Level 5 by using a custom ASIC for computing Reed-Solomon parity. Requires N+2 drives to implement because of dual parity scheme.

Recommended Applications

  • File and Application servers.
  • Database servers.
  • Web and E-mail servers.
  • Intranet servers.
  • Excellent fault-tolerance with the lowest overhead.
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