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Distributed Operating System is a model where distributed applications are running on multiple computers linked by communications. A distributed operating system is an extension of the network operating system that supports higher levels of communication and integration of the machines on the network. This system looks to its users like an ordinary centralized operating system but runs on multiple, independent central processing units (CPUs).
Distributed systems use multiple central processors to serve multiple real-time applications and multiple users. Data processing jobs are distributed among the processors accordingly.
The processors communicate with one another through various communication lines (such as high-speed buses or telephone lines). These are referred as loosely coupled systems or distributed systems. Processors in a distributed system may vary in size and function. These processors are referred as sites, nodes, computers, and so on.

Eg:
  • IRIX operating system; is the implementation of UNIX System V, Release 3 for Silicon Graphics multiprocessor workstations.
  • DYNIX operating system running on Sequent Symmetry multiprocessor computers.
  • AIX operating system for IBM RS/6000 computers.
  • Solaris operating system for SUN multiprocessor workstations.
  • Mach/OS is a multithreading and multitasking UNIX compatible operating system;
  • OSF/1 operating system developed by Open Foundation Software: UNIX compatible.


ADVANTAGES OF DISTRIBUTED OPERATING SYSTEM

The advantages of a distributed operating system are:-
  • With resource sharing facility, a user at one site may be able to use the resources available at another.
  • Speedup the exchange of data with one another via electronic mail.
  • If one site fails in a distributed system, the remaining sites can potentially continue operating.
  • Better service to the customers.
  • Reduction of the load on the host computer.
  • Reduction of delays in data processing.


DIFFERENCES BETWEEN DISTRIBUTED OPERATING SYSTEM & NETWORK OPERATING SYSTEM








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