Adaptec 2020SA User Guide - Page 148
RAID50, read and write performance. Parity, used in the second level
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About RAID RAID 50 This dual-level RAID type is created by using two or more equalsized RAID 5 arrays to create a RAID 0. The top level RAID 0 shares the load among the second-level RAID 5s, improving both read and write performance. Parity, used in the second level RAID 5s, provides efficient redundancy. RAID 50 RAID 5 Data 0 & Data 1 Data 4 & Data 5 Data 8 & Data 9 Data 12 & Data 13 RAID 0 Drive Data 0 Data 4 Parity A2 Data 12 Drive Data 1 Parity A1 Data 8 Data 13 Top-Level Arrays Second-Level Arrays RAID 5 Data 2 & Data 3 Data 6 & Data 7 Data 10 & Data 11 Data 14 & Data 15 RAID 0 Drive Parity A0 Data 5 Data 9 Parity A3 Drive Data 2 Data 6 Parity B2 Data 14 Drive Data 3 Parity B1 Data 10 Data 15 Drive Parity B0 Data 7 Data 11 Parity B3 Note: Adaptec 2410SA does not support RAID 50. E-5