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RAID Level:
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RAID 6: Independent Data disks with two independent distributed parity schemes







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 (two-dimensional 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

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Disadvantages

Very complex controller design

Controller overhead to compute parity addresses is extremely high

Very poor write performance

Requires N+2 drives to implement because of two-dimensional parity scheme





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