In the existing system of the project we had just results that is usage through manually,here student can check through the computers from a personal computer located at a particular point of place.

Introduction
In this chapter we discuss the construction of baseline models of existing
systems. This activity relies on knowledge of the hardware, software,
workload, and monitoring tools associated with the system under study.
It also requires access to information recorded by accounting and software
monitors during system operation. Here, we describe general approaches
applicable to a variety of systems. In Chapter 17, we illustrate these
approaches with an example based on a specific system (IBM’s MVS) and
a specific monitoring tool (RMF).
In Chapter 4 we divided the inputs of queueing network models into
three groups: the customer description, the center description, and the service
demands. The structure of the present chapter reflects this division.
Section 12.3 is devoted to the customer description: the correspondence
of the workload components of the system to the customer classes
of the model. In specifying the values of the customer description parameters,
we are answering questions such as:
- How many customer classes are required?
- Of what type (transaction, batch, or terminal) should each class be?
- What should be the workload intensity value (A, N, or N and Z)
for each class?
Section 12.4 is devoted to the center description: the correspondence
of the resources of the system to the service centers of the model. In
specifying the values of the center description parameters, we are answering
questions such as:
- What devices and subsystems should be included in the model?
- How should each of these entities be represented (e.g., as a queueing
center, a delay center, or an FESC)?
Section 12.5 is devoted to the service demands: the description of the
interactions between customers and centers. In specifying the values of
the service demand parameters, we are answering the question: