Definition
The Redundant Array of Independent Disks 2 (RAID 2) is one of the RAID levels. However, it is outdated and is rarely employed in modern computing systems.
Regardless of its technical architecture, RAID 2 was not common due to its cost and complexity. The emergence of affordable and more effective error-correcting techniques and R setups, such as RAID 6 AND RAID 5, rendered RAID 2 obsolete.
Description of RAID 2
- Error correction: It applies the Hamming code to correct errors, meaning it may flag two and single-bit errors.
- Synchronization: RAID 2 utilizes a synchronized whirling of the disk drives, meaning all the disks are in sync, allowing them to read and write simultaneously.
- Bit-level striping: RAID 2 strips information at the bit level, unlike RAD 0, which utilizes block-level stripping.
- Error Correction Code (ECC): RAID 2 setups include a customized disk for maintaining ECC data alongside the information disks.