This preview shows page 1. Sign up to view the full content.
Unformatted text preview: rs of workstations include
IBM, DEC, Hewlett-Packard (HP), and Silicon Graphics.
There are several organizations such as banks, insurance companies, hospitals,
railways, etc. that need to process large number of transactionson-line and requirecomputer systems having massive data storage and processing capabilities.
Mainframe systems are computer systems that are mainly used for handling the
bulk of data and information processing of such organizations. They are also used
in such environments where a large number users need to share a common
computing facility such as in research groups, educational institutions, engineering
By its very nature of usage, a mainframe system is housed in a central location
with several user terminals connected to it. The user terminals act as access
stations and may or may not be located in the same building in which the
mainframe system is located.
A typical configuration of a mainframe system consists of the following
components (see Figure 20.4).
1. Host, front-end, and back-end computers. A mainframe computer system is
usually composed of several computers (subordinate computers) in addition to the
mainframe, or host computer. The host computer carries out most of the
computations and has direct control over all the other computers. The other
computers relieve the host computer of certain routine processing requirements.
For example, & front-end computer is used for handling communications to and
from all the user termini connected- to the computer system, thus relieving the
host computer of communications-related processing requirements. Similarly, a
back-end computer is used to handle data I/O operations, thus relieving the host
computer of locating a particular I/O device and transferring data to or from it.
Although the host computer could itself perform all these operations, the
subordinate computers provide a boost to the overall system efficiency by
relieving the host computer of time-consuming chores that do not require
processing speed. The host computer of many modern mainframe systems are
View Full Document
This document was uploaded on 04/07/2014.
- Spring '14