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RAID 2

RAID2

Advantages

"On the fly" data error correction.

Extremely high data transfer rates possible.

The higher the data transfer rate required, the better the ratio of data disks to ECC disks.

Relatively simple controller design compared to RAID levels 3,4 & 5.

Disadvantages

Very high ratio of ECC disks to data disks with smaller word sizes - inefficient.

Entry level cost very high - requires very high transfer rate requirement to justify.

Transaction rate is equal to that of a single disk at best (with spindle synchronization).

No commercial implementations exist / not commercially viable

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