The so-called RAID is the abbreviation of the Redundant Array Of Independent Disk. . RAID technology is generally used above the server or large workstation, but with the continuous maturity of RAID technology, there are now many household PCs' motherboards have a RAID chip. RAID technology has primary 6, which are RAID 0 ~ RAID 5, which have their own advantages and disadvantages, so different technologies should be selected according to different actual conditions. Below we will briefly introduce these six RAID technology. The principle of RAID 0 RAID 0 is simple, that is, connect N hard drives, then divides a large number of data into a sized stripping, and then divide each strip into N simultaneously writes to each hard disk. This way, the read and write speed of the data will increase n times, but RAID 0 has no redundancy function, once one of the hard disk is corrupted, all data will not be used, so the reliability will be greatly reduced, only equal to the use of one piece alone 1 / n of the hard disk, so the RAID0 technology is not suitable for performing a key task. RAID 1 RAID 1 uses disk mirroring technology, which is divided into two copies into two copies. Half of them is used to make another half of backup, the advantage of doing it is to maximize the maximum guarantee without affecting performance. The reliability and removability of the system. Of course, in the 6-class RAID technology, the cost of RAID 1 is the highest, and the utilization rate of the hard disk is the lowest - only 50%. Therefore, RAID 1 is primarily used to save critical data. RAID 2 RAID 2 integrated with coaxial synchronization techniques and ECC (ERROR Checking and Correcting) inspection technology, the principle is to divide several hard drives into two groups, which are used to store data and checkboxes. RAID2 is a bit (bit) and calculate its ECC code, and then written to each hard drive. If a hard disk is faulty, the system can calculate the correct data to recover according to the sea code and the rest of the effective data. Because the access of RAID2 is carried out simultaneously with all hard drives, it is stored in the store, so the access to a sector is greatly weakened, and in terms of disk utilization, RAID2 is generally only used in 15 hard drives. The advantages of its utilization will be highlighted in the system. Therefore, RAID2 is not suitable for use in network servers, small machines, or PCs.
