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    RAID LEVEL 6: Independent Data Disks with Two Independent Parity Schemes
    0 1 2 3 4 5 6 10 50 0+1
    RAID LEVEL 6: Independent Data Disks with Two Independent Parity Schemes
    0 1 2 3 4 5 6 10 50 0+1

    Two independent parity computations must be used in order to provide protection against double disk failure. Two different algorithms are employed to achieve this purpose.

    RAID Level 6 requires a minimum of 4 drives to implement

    Featured Product

    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
    • RAID 6 protects against multiple bad block failures while non-degraded
    • RAID 6 protects against a single bad block failure while operating in a degraded mode
    • 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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