IBM ZVM - FOR LINUX V6 RELEASE 1, Начало работы

Страница: 15 / 172

Chapter 1. About z/VM
This topic is a z/VM primer and covers general VM concepts, such as editing and
finding files, required to complete z/VM system tasks.
When you log onto z/VM, you have the functional equivalent of a real computer
and its associated devices at your fingertips. This functional equivalent of a
computing system is called a
virtual machine . Virtual machines are not real, but do
work like real systems. Everyone in your entire organization can use z/VM to
share the resources of a single computer, while at the same time accessing the
system as if each is the only user.
Figure 1 shows a stylized representation of a real mainframe computing system.
Each real computing system has one or more central processing units (CPUs),
storage (memory), peripheral devices for input and output, such as disks, tapes,
printers, and displays, and the operator console. The operating system manages all
these resources to do work.
z/VM virtualizes real computing resources so that each user appears to have a
complete mainframe computing system, as shown in Figure 2 on page 2. This
means each virtual machine can run its own operating system to manage its virtual
resources. It also means you can perform virtual machine tasks as if they were real
machine tasks: you can boot (perform an
initial program load of) an operating
system, attach and detach devices, and manage the work of your virtual machine
operating system.
CPU
1
.
.
.
CPU
2
CPU
n
CPU
0
central storage
channels
control
units
operating system
disk tape printer
operator
console
user
displays
Figure 1. Representation of a mainframe computing system
© Copyright IBM Corp. 2009
1