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.
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Variable-length deduplication typically reduces disk backup capacity by more than 90% and allows existing networks to be used for automated DR protection.
In the digital age, maximizing asset value often means using different storage tiers with different cost and access characteristics for data in different stages of its life.