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RAID 3 - Explanation and Solutions

RAID 3: Striping (byte) and Parity Drive (fixed)

RAID 3 is a simplified version of RAID 2. Instead of multiple ECC bits found in RAID 2, bit parity is used. RAID 3 disperses data at the bit level, as in RAID 2. This scheme consists of an array of HDDs for data and one unit for parity. Fig. 5 shows an example of RAID 3. The scheme generates from XOR (exclusive-or) parity derived from bit 0 through bit7. If any of the HDDs fail, it restores the original data by an XOR between the redundant bits on other HDDs and the parity HDD. With RAID 3, all HDDs operate constantly. It is not a very effective method for accessing small amount of data, but RAID 3 is rather suitable for specialized use where large block of data need to be processed at high speed, as in supercomputers.

Ultra160 SCSI 6 Bay

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