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raid、裸容量、可用容量的概念（The concept of raid, bare capacity, available capacity）.doc

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raid、裸容量、可用容量的概念（The concept of raid, bare capacity, available capacity）

raid、裸容量、可用容量的概念（The concept of raid, bare capacity, available capacity） The concept of Raid, bare capacity, available capacity Raid concept L Raid brief introduction Simply speaking, RAID is a multi block independent hard disk (hard disk) according to the different ways are combined to form a hard disk group (logical disk), so as to provide higher performance than a single hard disk storage and data backup technology. The different ways of forming a disk array are called RAID levels (RAID, Levels). L RAID 0: error free control band group To implement RAID0, you must have more than two hard drives, and RAID0 implements a band group. The data is not stored on a hard disk, but instead is divided into data blocks and stored on different drives. Because data is distributed across different drives, the throughput of data is greatly improved and the load of the drive is balanced. If just the data needed is the best on different drives. It does not need to calculate check codes, so it is easy to implement. Its disadvantage is that it does not have data error control, and if the data in a drive is wrong, even if the data on the other disk is correct, it will be useless. It should not be used on occasions where data stability is high. Using RAID0 is appropriate if the user carries out images (including animation), edits, and other occasions where larger transfers are required. At the same time, RAID can increase data rates, such as the need to read files distributed on two hard disk, the two hard disk can be read simultaneously. So the time to read the same file was shortened to 1/2. At all levels, RAID 0 is the fastest. However, RAID 0 has no redundancy, and if a disk (physical) is corrupted, all data is unavailable. L RAID 1: mirror structure For the use of the RAID1 structure of the device, the RAID controller must be able to simultaneously on the two disk read operation and the two mirror disk write operation. From the following diagram, you can also see that there must