- RAID 6 is essentially an extension of RAID level 5 which allows for additional fault tolerance by using a second independent distributed parity scheme
- 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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- Complex controller design
- Controller overhead to compute parity addresses is extremely high
- Very poor write performance
- Requires N+2 drives to implement, because of second parity
- We are not aware of any commercial RAID 6 implementations
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