ENVS 1500 Lecture Notes - Lecture 20: Distributed Computing Environment, Ibm Mainframe, Distributed Computing
13 May 2018
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ENVS 1500 Tutorial 20 Notes – Feasible and Practical
Introduction
• Many modern computing systems include additional operating system modules to make
distributed processing feasible and practical.
• Distributed Computing Environment (DCE), is an Open Group standard that establishes a
set of features for a distributed computing operating system.
• Open Group is an organization that promotes open computing by setting standards and
certifying products in a number of major areas of computing.
• UNIX is arguably the best known Open Group standard.
• The DCE standard is supported and incorporated into the operating systems of a
number of major vendors, including Microsoft, Sun, and IBM.
• There are, of course, other ways of categorizing computer systems.
• One way of describing systems that is sometimes useful is to consider the intent and
philosophy of the designers of the system.
• This description can sometimes provide a lot of insight into the strengths and
weaknesses of a system.
• For example, the IBM mainframe operating system, z/OS, is an offshoot of an operating
system that was originally designed primarily for large, batch-oriented business
transaction processing systems.
• As business users moved their operations online, predecessors of z/OS were provided
with capabilities to handle large numbers of online transactions.
• This would suggest that the modern z/OS is well equipped to handle routine Web
transactions from hundreds or thousands of network clients concurrently.
• At the same time, it might suggest that z/OS is not particularly user-friendly to
individuals doing their own independent work on the system.
• Development tools are more difficult to use on z/OS than on many other systems.
• Most people would agree that these statements describe z/OS fairly well.
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