PERFOMANCE ANALYSIS AND FAULT TOLERENCE OF SOFTWARE ENVIRONMENT

Fault tolerance is the characteristic of a system that tolerates the class of failures. It will analysis the performance and enables a system to continue its intended operation, possibly at a reduced level, rather than failing completely, when some part of the system fails. The system as a whole is not stopped due to problems either in the hardware or the software. [1] [2] Fault tolerance is the ability for software to detect and recover from a fault that is happening or has already happened in either the software or hardware in the system in which the software is running in order to provide service in accordance with the specification. [3] Fault tolerance is not a solution unto itself however, and it is important to realize that software fault tolerance is just one piece necessary to create the next generation of systems. A highly fault-tolerance system might continue at the same level of performance even though one or more components have failed. For example, a building with a backup electrical generator will provide the same voltage to wall outlets even if the grid power fails [4]