In 20 years of in the past, computer technology change quickly intervened gradually the square field surface of our life: Commerce, education, recreational, recreation... at the same time each respects raised taller requirement to computer technology ceaselessly, to get used to the need of people, computer technology is ceaseless changing in each respects. Now this society, our all the time does not need information and consumptive information. Of Internet gain ground more drama information influences growth into geometry, store then information and prevent information to lose became a first issue. The device that uses at memory information data of course is crucial: For instance for large to website, of the moment that brings about a website because of the breakdown of storage equipment break down, bring the several losses with 1 million yuan possibly also. Very apparent odd * backs up simply with many hard disk cannot from go up at all solve a problem. At this moment one kind calls independence redundant disk array (RAID: Redundant Array Of Independent (or Inexpensive) Disks) technology with respect to emerge as the times require, this kind of technology can distributing data to many hard disk, acquire better stability and property thereby. Regard common computer as the user, perhaps you just are familiar with IDE or software RAID solution, the article lets you know the inside story of RAID technology namely.

One, what is RAID
RAID says popularly even if rise through organizing many storage equipment according to proper form and plan, as using a hard disk same but the solution of the storage equipment of the stability with was gotten higher than individual storage equipment rate, better through such form however, larger storage capacity. Differ according to your need, can use different form and different price (go to 10 thousand yuan about a hundred from thousands of yuan) RAID solution -- very apparent, exceed good RAID system, the price is higher, do not have first-rate RAID system almost so. Additional, choice Raid system should get used to different applied program.
Generally speaking RAID is to be used in more expensive server system. Nevertheless, as the occurrence of cheap RAID controller, it had developed to market main trend gradually. Realize RAID to have certain limitation in current mainstream market of course, it does not apply to each person. Have a lot of phyletic RAID Levels at present. When introducing the distinction of different RAID mode, I should summarize a few basic ideas.

2, array and RAID controller

Array of a driver is the gather of driver of many hard disk. Want to understand RAID, we should clear up a few basic ideas again.

·Physical driver array can be parted or combination becomes or array of many logistic driver.
·Logistic driver array is comprised by the logistic driver that can be pleasant to the eye in the operating system.
·Logistic driver can be a hard disk also can be a partition in hard disk.
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