ENVS 1500 Lecture Notes - Lecture 8: System Administrator

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ENVS 1500 Tutorial 8 Notes System generation
Introduction
Together with the name of the user and the percent of CPU and memory a resource
consumed, shows the efficiency of virtual storage, and provides many other useful
system parameters.
It even provides an analysis of the data shown.
Although the typical user might not find a report such as this very useful in terms of
what steps to take as a result of the information presented, a skilled system
administrator can make valuable use of the information in determining ways in which to
improve system performance.
A consistently heavy load on a particular disk might suggest splitting the most used files
on that disk onto two separate disks, so that they might be accessed in parallel, for
example.
Or heavy use of the CPU by a particular user during peak hours might suggest lowering
the priorities for that user at those times.
One of the most important system administration tasks to be performed is the creation
of an operating system tailored to the specific needs of a particular installation.
The process of building a system is called a system generation, or more familiarly, a
sysgen.
The result of a sysgen matches the operating system to the characteristics and a feature
of the hardware provided and includes the desired operating system features and
performance choices.
Two primary means are used to tailor the system
By selecting the operating system program modules to be installed.
Typically, an operating system provides a large number of modules that might be used
under different circumstances.
Only those modules that are relevant to the installation are selected.
As an example, a particular installation has an individualized selection of I/O devices.
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