ENVS 1500 Lecture Notes - Lecture 17: Mainframe Computer, Multiprocessing, System Administrator
13 May 2018
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ENVS 1500 Tutorial 17 Notes – Central Facility
Introduction
• Mainframe systems were originally created to allow hundreds of users to share the
computing power of a central facility.
• As well as to support batch data processing operations such as billing and credit card
processing.
• Today, mainframe operating systems manage typical mainframe computer hardware
made up of clusters of multiprocessor units
• All designed to work together as a single processing unit, with hundreds of gigabytes of
memory, fem to bytes of disk storage and I/O and networking capabilities of hundreds
of gigabytes per second.
• Mainframe operating systems differ from smaller multitasking systems in the variety of
features that they offer
• In the versatility with which they can be configured, with the level of security that they
supply, with the degree of control that they offer the system administrator(s), and in the
overall amount of power and capability that they offer.
• Network server systems are similar to single-user multitasking systems in most respects.
• However, the major focus of system use is shifted from meeting the needs of the direct
user to the support of clients connected to the server through a network.
• The server may have no direct user facilities of its own, other than those required for
management of the system.
• The server is designed to provide Web services, file services, print services, application
services, and/or database services to the clients, as determined by the particular
requirements of the system application.
• It may also provide some program execution services for clients, including support for
client system start-up, particularly on networks with thin clients.
• Network servers often work together in clusters.
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