FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Redundancy is a common approach to improve the reliability and availability of a system. Adding redundancy increases the cost and complexity of a system design and with the high reliability of modern electrical and mechanical components, many applications do not need redundancy in order to be successful.

Detailed explanation-2: -Redundancy is used in system design with the purpose of increasing reliability. It is found in many engineering systems such as bridges, distribution systems, process plants and communication systems. Redundancy may be defined as the provision of more than one means of performing a required function.

Detailed explanation-3: -The purpose of a redundancy is to prevent any disruption of system operation in the case of a technical failure or disaster by maintaining a continuity of service.

Detailed explanation-4: -A redundant part or component increases reliability because it is connected in parallel, not in series. A redundant part decreases reliability if the reliability of the redundant part is lower than that of the part it is backing up.

Detailed explanation-5: -Redundant solutions are usually less expensive, easier to implement, and easier to manage. Note that replication, as part of a redundant solution, has numerous functions other than availability.