operating system

It is the type of multiple CPU system is the clustered system. like multiprocessor systems, clustered system gather together multiple CPUs to accomplish computational work. clustered systems differ from multiprocessor systems, however, in that they are composed of two or more individual systems-or nodes- joined together. The definition of term clustered is not concrete; many commercial packages wrestle with what a clustered system is and why one form is better than another. The generally accepted definition is that clustered computers share storage and are closely linked via a Local Area Network(LAN) or a faster interconnect, such as InfiniBand. clustering is usually used to provide High-availability service; that is service will continue even if one or more systems in the cluster fail. High availability is generally obtained by adding a level of redundancy in the system. A layer of cluster software runs on the cluster nodes. Each node can monitor one or more of the others (over the LA

An operating system (OS) is the program that ,   after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs make use of the operating system by making requests for services through a defined application program interface ( API ). In addition, users can interact directly with the operating system through a user interface, such as a command-line interface (CLI) or a graphical UI (GUI). Why use an operating system? An operating system brings powerful benefits to computer software and software development. Without an operating system, every application would need to include its own UI, as well as the comprehensive code needed to handle all low-level functionality of the underlying computer, such as disk storage, network interfaces and so on. Considering the vast array of underlying hardware available, this would vastly bloat the size of every application and make software development impractical. I