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Chapter 10. Performing run-time tasks
This topic covers proactive tasks you need to do to keep z/VM and Linux virtual
servers running efficiently. It includes ways for you to monitor z/VM operations
so you can prevent system problems.
For monitoring system performance, see Chapter 11, "Monitoring performance and
capacity," on page 117.
Overview of console types
During run-time operations, you can use several consoles. Consoles can be located
on the same physical device (workstation, PC, display) or on separate devices.
Because of the flexibility of z/VM, the number of consoles varies: you might have
a few or many Linux production systems, each with their own console. Regardless
of the number of consoles, these are the types of consoles available and a
description of each:
v Hardware management console. The hardware management console
v Integrated ASCII console. The integrated ASCII console can be used to
v System operator console. The system operator console is the console at which CP
v Logical operator console. If you followed "Setting up the programmable
v Virtual console for a virtual machine. When you log onto z/VM as a user, the
v Linux's system console. The virtual console becomes the Linux system console
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communicates with the hardware. From this console you load (IPL) z/VM itself.
You can also do basic z/VM system management from the hardware
management console. For details, consult the documentation for your hardware
management console.
communicate with a Linux guest without the need for any special connectivity
or additional hardware, such as control units or network connections. z/VM
itself does not exploit the ASCII console, but z/VM can attach it to and detach it
from a Linux guest, and query the status of the console. z/VM manages the
console as a dedicated device; that is, only one Linux guest can use it at a time.
Your Linux guest must be configured to use the ASCII console.
The console provides a VT220 interface for Linux, so you can use Linux tools
such as vi and emacs. In an emergency, when no other connectivity is available,
this connection could be used, though the console is not limited to such use. For
more information, see "Step for managing real devices" on page 100.
automatically logs on the primary system operator virtual machine at z/VM
load time. In "Steps for setting addresses for consoles" on page 46, you set the
real address for this console.
If you do not use the programmable operator facility, you perform system tasks
from this console, such as loading z/VM, shutting z/VM down, controlling real
devices, communicating with users, and responding to z/VM problems.
operator" on page 88, the system console is automated, and you perform system
tasks from the logical operator console. In this section, it is assumed you
perform real system tasks from the logical operator console.
session you enter is the virtual console. You use this console to control Linux's
virtual machine. The tasks you can do from the virtual console include loading
Linux, defining the storage size of the virtual machine, and defining virtual
CPUs.
once Linux is loaded. Linux system messages are displayed on this console.
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