RAID技术规范（国外英文资料）.docVIP

RAID技术规范（国外英文资料） (1) introduction of RAID technology specifications Redundant disk array technology originally developed the purpose is to combine small cheap disk instead of a big expensive disk, mass data storage in order to reduce the cost, at the same time also hope that with the method of redundant information, makes a disk failure will not make access to data loss, so as to develop a certain level of data protection technology, and can properly improve data transmission speed. In the past, RAID has always been a high-end server for high-end SCSI hard drives. Recently with the development of technology and product cost is falling and the IDE hard disk performance had the very big promotion, together with the popularity of RAID chip, the RAID also gradually get application on the PC. So why is it called redundant disk array? Redundant Chinese means redundant and repetitive. The disk array specification is not just a disk, but a set of disks. At this point you should understand that it is the use of duplicate disks to process data and improve the stability of the data. (2) how RAID works How does RAID achieve high stability in data storage? Lets take a look at how it works. RAID varies according to the implementation principle, and there is a difference between working patterns at different levels. The whole RAID structure are some disk structure, through the study of the combination of the disk to improve efficiency, reduce the error of the purpose, dont be scared because so many nouns, the principle of them actually very simple. For illustration purposes, each square in the diagram below represents a disk, a block or disk array, called a zone. (3) RAID specifications There are a number of specifications, including RAID 0 ~ RAID 7, which have different priorities, and common specifications include the following: RAID 0: the zone group with no error control To implement a raid 0 must have two or more hard drives, raid 0 realized with block, data is not stored in