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Multicasting Images 475

Novell Confidential Manual (99a) 28 October 2003

46 Multicasting Images

Novell

ZENworks

for Desktops (ZfD) Imaging software includes an imaging multicast

capability. The following sections explain what this is, why you might want to use it, and the

overall procedure for using it.

 “Introduction to Multicasting” on page 475

 “Multicast Procedure” on page 476

Introduction to Multicasting

The following topics are covered in this section:

 “What Is Multicasting?” on page 475

 “Why Use Multicast?” on page 475

What Is Multicasting?

To multicast an image is to take an image of one computer (the master), immediately send it over

the network to multiple other computers (the participants), and put it down simultaneously on

those computers. You can specify a workstation as the session master, or you can specify an image

file that you have previously saved and customized.

If the session master is a workstation, a base image is taken of all the partitions on the hard disks

and other storage devices (such as Jaz drives) of that workstation.

Before the image is put down on the participating computers, all existing partitions are removed

from the hard disks and writable storage devices of those computers.

NOTE: For multicasting to work properly, the routers and switches on the network must have multicast

features configured. Otherwise, multicast packets might not be routed properly.

(Historical note: In versions of ZfD prior to ZfD 3.2, the master had to be a Linux workstation,

which formerly restricted multicasting to exact "cloning" of the workstation.)

Why Use Multicast?

Multicasting is the way to use ZfD Workstation Imaging services for mass reimaging with the least

amount of overhead. It is useful if you have one computer with a clean software configuration that

you want to duplicate on several other machines, or if you have a single image that you want to set

up on multiple machines.

With multicasting, all you need is a physical network with modern routers and switches. (If you

will be setting up multicasting by visiting each computer, you will also need imaging boot

diskettes, an imaging boot CD, or the computers must be PXE-enabled.) The computers that will

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Abocom RE450 Installationsanleitung Seite 39