Labels:text | screenshot | line | number | parallel | font OCR: RAID PERFORMANCE VS. COST 16 14 RAID 1 and 5 Reads 12 RAID 1 Writes RAID 5 Writes 10 6 4 (x Bandwidth of 1 drive) 2 3 4 5 6 7 8 9 10 11 12 13 14 Figure 4: Notice that RAID 1 mid RAID 5 perform read equally. Both of these RAID levels can read independently and simultaneously from all drives for maximum performance. RAID 1 has much lower write performance; each write must be duplicated to two drives, making write performance one-half that of an equal number of unmirrored drives. RAID 5 writes suffer even more, depending on the size of the write; a single block write is less efficient than one that involves a stripe set because the parity block only needs to be read and written once.
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