And you know what a RAID array?

Data Reliability – this is one of the most important and topical issues in computer systems. Therefore, in this direction has focused a lot of effort and development, and as a result led to the creation of RAID arrays, which, despite the fact that it was invented a few years ago is quite relevant and in demand at this time.

Let's try to understand what kind of technology. First, let's define the main term. So, RAID – this is a redundant variety of independent disks serving to increase the resiliency and efficiency of computer systems. The first is achieved because of the redundancy, and the second – due to the simultaneous operation of drives that are in the created array. It is worth noting that the RAID system is used as a single disk due to the interaction of hardware and software.

To answer the question about how to create a RAID array, it is necessary to mention that there are several different variations (levels), the implementation of which depends on the organization of work drives. General work disks can be arranged using either a parallel or independent access. In the first case, for recording information, the disk space is divided into strips (blocks), which then fall on different physical disks (capacity increases due to the simultaneous recording of the strips). When read, the information also all transactions are units that contribute to the greater growth of efficiency of the system. Moreover, the more disks, the more efficient will be the RAID array. But there are nuances. To organize such a system is impossible if the block size is larger than the size of the write request data.

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In the case of independent access to all information of individual user query is written in the same way as you would with one logical disk, but unlike the latter situation, the read operation will be performed on different (separate) disks.

At this time there are several standard ways of organizing (levels) of a system such as a RAID array. They are numbered from 0 to 6 and refers to them as RAID 0, RAID 1 and so on. In practice, the most commonly used levels are 0, 1, 3, and 5.

So, to build an external RAID array, you need to have two components: a RAID controller performing the functions of distribution of incoming information, communication with the main server, generating redundant data, and every array of hard drives. This so-called hardware option to create a RAID array. But this is not the only way of organizing disks. The building of such a system is possible from so-called software environment. In this embodiment, the creation of RAID arrays is carried out using special tools, which supports one or the other operating system. The disadvantage of this implementation is that if it fails the PC software will be lost all information stored on the logical RAID drives. In addition, we must remember that software can build an array of only the first and zero level.