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Posted on 11/7/2024 11:18:47 AM
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Redundancy refers to redundant and unnecessary parts. Redundancy technology generally refers to the use of additional resources or measures in system design to enhance system reliability and fault tolerance.
The concept of redundancy has emerged in many areas. In the field of information technology, redundancy usually refers to duplicate parts of data, information, or systems. In everyday language, when we say that something is redundant, it means that the thing or part is redundant and not necessary. Usually includedTime redundancy, information redundancy, structural redundancy, and redundancy additional technologies。
Time redundancy
1. Time redundancy technology refers to eliminating the impact of instantaneous errors by repeatedly executing instructions or programs.
2. This technique assumes that transient errors are sporadic and do not persist.
3. Therefore, by performing the same operation several times, it is expected to avoid errors in at least one execution.
4. Time redundancy technology is often used to improve the reliability of software or hardware systems, especially in applications with low tolerance for errors.
Information redundancy
1. Information redundancy technology is a method of adding some additional information (i.e., redundant information) in addition to the information required to achieve normal functions to ensure the correctness of the operation results.
2. This technology is commonly used in communication and storage systems to detect and correct errors in data transmission or storage processes by adding redundant information such as error detection codes (such as parity codes) and error correction codes.
3. For example, in network communication, the TCP protocol uses the ACK confirmation message mechanism and checksum method to detect and correct errors in data transmission.
Structural redundancy
1. Structural redundancy technology is one of the commonly used redundancy technologies, which mainly focuses on the redundant design of the hardware and software structure of the system.
2. According to its working method, structural redundancy can be divided intoThere are three types of static redundancy, dynamic redundancy, and hybrid redundancy。
Static redundancy
1. Also known as shielding redundancy or passive redundancy.
2. It usually includes multiple identical or similar modules that work in parallel and block errors that occur in the system by voting and comparing.
3. For example, three-mode redundancy is to vote on the running results of three modules with the same function but developed by different methods, with the majority result as the final result of the system.
Dynamic redundancy
1. Also known as active redundancy.
2. It mainly achieves the purpose of fault tolerance through fault detection, fault location and fault recovery.
3. In dynamic redundancy, the standby module is in standby state, and when the system detects an error in a working module, it immediately replaces it with a spare module and reruns it.
Mixed redundancy
1. It is a combination of static redundancy and dynamic redundancy, which combines the advantages of both redundancy technologies to provide a higher level of fault tolerance.
Redundant additional technology
1. Redundant additional technology refers to the resources and technologies required to realize the above redundant technologies, including programs, instructions, data, space and channels for storing and mobilizing them, etc.
2. These technologies and resources are the basis for ensuring that redundancy technologies can work properly, and they provide additional guarantees for the system to deal with various failures and errors that may occur.
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