Hva er en RAID?

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Hei!

 

Som tittelen sier, hva er en raid?

[am3k]

"Redundant Array of Inexpensive Disks" er en måte å bruke flere harddisker på slik at en oppnår høyere ytelse, større datasikkerhet eller begge delene. Se for øvrig vår RAID Guide for en grundigere innføring.

 

In computing, a redundant array of independent disks (more commonly known as a RAID) is a system of using multiple hard drives for sharing or replicating data among the drives. The benefit of RAID is increased data integrity, fault-tolerance and/or performance, over using drives singularly. In its original implementations (in which it was an abbreviation for "Redundant Array of Inexpensive Disks"), its key advantage was the ability to combine multiple low-cost devices using older technology into an array that together offered greater capacity, reliability, and/or speed than was affordably available in singular devices using the newest technology.

 

At the simplest level, RAID is one of many ways to combine multiple hard drives into one single logical unit. Thus, instead of seeing several different hard drives, the operating system sees only one. RAID is typically used on server computers, and is usually implemented with identically-sized disk drives. With decreases in hard drive prices and wider availability of RAID options built into motherboard chipsets, RAID is also being found and offered as an option in higher-end end user computers, especially computers dedicated to storage-intensive tasks, such as video and audio editing.

 

The original RAID specification suggested a number of prototype "RAID Levels", or combinations of disks. Each had theoretical advantages and disadvantages. Over the years, different implementations of the RAID concept have appeared. Most differ substantially from the original idealized RAID levels, but the numbered names have remained. This can be confusing, since one implementation of RAID 5, for example, can differ substantially from another. RAID 3 and RAID 4 are often confused and even used interchangeably.

 

The very definition of RAID has been argued over the years. The use of the term redundant leads many to split hairs over whether RAID 0 is "real" RAID. Similarly, the change from inexpensive to independent confuses many as to the intended purpose of RAID. There are even some single-disk implementations of the RAID concept! For the purpose of this article, we will say that any system which employs the basic RAID concepts to recombine physical disk space for purposes of reliability or performance is a RAID system.

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Ser også at det finnes en tidligere tråd vedr. dette; Hva er RAID?

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Endret 22. mai 2005 av am3k