RAID 6 - Independent data disks with double parity

RAID 6 stripes blocks of data and parity across an array of drives like RAID 5, except that it calculates two sets of parity information for each parcel of data.
The goal of this duplication is solely to improve fault tolerance; RAID 6 can handle the failure of any two drives in the array while other single RAID levels can handle at most one fault.

Performance-wise, RAID 6 is generally slightly worse than RAID 5 in terms of writes due to the added overhead of more parity calculations, but may be slightly faster in random reads due to spreading of data over one more disk.

As with RAID levels 4 and 5, performance of RAID 6 level can be adjusted by experimenting with different stripe sizes.

See other RAID arrays below:

RAID 0 - Striped disk array
RAID 1 - Mirroring and duplexing
RAID 5 - Block interleaved distributed parity
RAID 6 - Independent data disks with double parity
RAID 10 - High reliability combined with high data performance


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