ENVS 1500 Lecture Notes - Lecture 8: System Administrator
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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