Asus Adaptec 2020 ZCR User Manual - Page 146
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About RAID RAID 1 offers no write performance advantage over a simple volume configuration. However, because the drives share read load equally, RAID 1 provides improved read performance. An example of a RAID 1 array is shown below. RAID 1 Drive Data 0 Data 1 Data 2 Data 3 Drive Data 0 Data 1 Data 2 Data 3 RAID 5 This RAID type requires at least three drives. Like RAID 0, data is striped across the drives. However, in RAID 5, parity is stored separately from data, and occupies the equivalent of one drive. The controller generates parity every time data is written to the array, and it is distributed in stripes across all the drives. In the event of a drive failure, the contents of the failed drive can be rebuilt from the data and parity on the remaining drives. RAID 5 Drive Data 0 Data 3 Data 6 Parity 3 Drive Data 1 Data 4 Parity 2 Data 9 Drive Data 2 Parity 1 Data 7 Data 10 Drive Parity 0 Data 5 Data 8 Data 11 E-3
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