What is the excess series of cheap disks?
Redundant field of cheap disks is a data storage system that is usually used on computers, especially computer systems that are often important or accessible. This type of system can be used in a number of different ways to ensure greater data availability through redundancy or increased data distribution performance. Each of these two primary goals can be achieved in their entire extent by sacrificing the second goal or partly as a combination of both goals. Redundant range of cheap disks is a common method of creating data storage system and in some professional sectors has become an industry standard. Modern use of "independent" rather than "cheap" was used only to discourage potential clients or users who believe this type of system will be cheap. While the discs themselves can be relatively cheap because there are a number of these discs, with at least two and potentially tens or hundreds, the excess number of cheap disks can still be quite expensive.
The basic idea of a redundant range of cheap discs is that more discs, each can store data, are used together in one system. For this system, computers or terminals connected to this system see the entire field as a single storage device when writing or reading from the field. Using multiple discs within a single field, there is potential for greater availability, access to data and greater power, speed to which the data is accessible.
Greater availability is created using redundancy of information in a redundant range of cheap disks. Only the disk, if the data on this disk is damaged, is lost without other forms of backup. However, a redundant field of cheap disks can be used to store the same data on multiple disks, and if one disk is damaged, data can still be obtained from another disk. This type of system is often referred to as the RAID-1 system.
Redundant field of cheap disks can also be used to increase performance. PTerry data is stored in separate pieces on multiple discs, not as copies, but as separate parts, data can be obtained faster, because each disc is accessible for one piece rather than waiting for each piece of data from different parts of a single disk. This is called "data stripping" and increases system performance, but not availability, and is usually referred to as the RAID-0 system. Other systems use a combination of both RAID types to improve performance while creating redundancy to ensure availability.