RAID Configurations: RAID 2

RAID 2
A RAID 2 requires a minimum of 2 hard drives to configure. Each bit of data is written to a data disk (4 in this example: 0 to 3). Each data word has its Hamming Code ECC word recorded on the ECC disks.

On read, the ECC code verifies correct data or corrects single disk errors. In certain instances a RAID 2 array can recover from multiple and simultaneous hard drive failure. The entry level costs for RAID 2 are extremely high, making it not commercially viable. A RAID 2 performs 'on the fly' error corrections.

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Did You Know?

Formatting a boot drive or partition can also damage or remove striping, which reduces the recoverability of data and causes permanent loss.

Common Causes for
RAID Failures

• Adding incompatible hard drives to the RAID array.
• Hardware conflicts with the hard drive and RAID server.
• Software corruption to the operating system.
• A virus infection, software or operating system upgrade.
• RAID controller failure or configuration change.
• Two or more hard drives fail or go offline.
• Server crashes and won't remount the array or volume(s).
• Configuration becomes corrupt or damaged.

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