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RAID 6 is an evolution of RAID 5. RAID 6 uses double parity for additional fault tolerance. Like in RAID 5, data is striped at a block level across the disk sets while parity information is generated and written across the array. Now it's possible for more than one drive to fail simultaneously, and the RAID will still operate.
Advantages
• Perfect solution for mission critical applications as it can sustain multiple drive failures.
Disadvantages
• Uses 2 drives for parity.
Application
Ideal for database servers, mail servers, web servers, intranet servers, video servers, transaction processing.
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- "Deleting Your Data Storage Dilemmas..!!!"