A form of RAID that can continue to execute read and write requests to all of a RAID array's virtual disks in the presence of any two concurrent disk failures. Several methods, including dual-check data computations (parity and Reed Solomon), orthogonal dual-parity check data, and diagonal parity, have been used to implement RAID Level 6.
Variable-length deduplication typically reduces disk backup capacity by more than 90% and allows existing networks to be used for automated DR protection.
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