RAID level-1E

A RAID level that uses both data striping and data mirroring to distribute data across three or more physical drives. Data is striped across each disk in the array; the first set of stripes are the data stripes, and the second sets of stripes are mirror copies of the first stripe, shifted one drive. It provides data redundancy and performance acceleration, although the usable physical drive space is reduced by 50 percent.

 

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