An Introduction to RAID

eiodotcom —  June 16, 2012 — Leave a comment

Today’s Eio post is on RAID technology.

What is RAID?

RAID is an acronym for “Redundant Array of Independent.” In essence, RAID is now a term for computer data storage systems that can divide, copy, and replicate data among multiple hard drives. It combines two or more physical drives to ensure that data is stored and handled properly.

There are several types of RAID, each with its own specific method of storing data properly. They are named by the word RAID followed by a number to indicate its unique goals of providing storage resiliency, performance, and capacity.

What is RAID used for?

Because of the tremendous amount of storage space, and the method by which RAID stores data, most serves use RAID. Servers are able to house much more space than a hard drive by itself.

The Different Types of RAID

RAID 0: This type has data stripping, which spreads files across two or more drives. This is used where maximum speed and performance are essential. However, if one drive fails, the data is lost.

RAID 1: Data is mirrored, or written to two drives simultaneously. If one of the disks fails, it can be replaced because it is backed up on both drives.

RAID 5: Data is striped across two or more discs (like RAID 0). The difference is if one disk fails, its data can be reconstructed and copied to a new disk using the copied information. This is the most popular form of RAID and is constantly on the rise.

There are other types of RAID (like the missing numbers of RAID 2-4). But these forms of RAID have either become obsolete, discontinued, or are no longer popular.

So check out some of Eio’s selections on RAID!

SANS DIGITAL IR12TB RAID 0 (stripping), RAID 1 (mirroring) Internal RAID 0/RAID 1 2 bay 2.5″ Hard Drive Enclosure

SANS DIGITAL TS5CT 0, 1, 10, 3, 5, Clone (N-way Mirror) with Hot Spare, and JBOD 5 x Hot-Swappable 3.5″ Drive Bays

iStarUSA BP-34-RED 3×5.25″ to 4×3.5″ SATA2.0 Hot-Swap Backplane Raid Cage

See also:

http://blog.eio.com/2012/06/01/cloud-storage-101/

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