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Multicasting Images 215

Novell Confidential Manual (99a) 11 September 2003

18 Multicasting Images

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.

 “What Is Multicasting?” on page 215

 “Why Use Multicast?” on page 215

 “Multicast Procedure” on page 216

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 lay it down simultaneously on

those computers.

As with all imaging operations involving a base image, the image is taken of all the partitions on

the hard disks and other storage devices (such as Jaz* drives) of the master computer. Before the

image is laid down on the participating computers, all existing partitions are removed from the

hard disks and writable storage devices of those computers.

To conduct a multicast session, you can set up an automatic session by defining the session in

ConsoleOne

, or you can physically visit each computer.

You can specify an image file or a workstation as the session master. Multicasting an image file

from an imaging proxy server is new in ZfD 3.2. In previous versions of ZfD, the master had to be

a Linux* workstation, which restricted multicasting to exact "cloning" of the workstation.

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.

Why Use Multicast?

Multicasting is the way to use ZfD 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 without needing to prepare an image or CD, and without

needing to install or configure any ZfD software on a server or on the target computers.

If you are setting up a multicast session through ConsoleOne, you have the option of preparing an

image and specifying it as the master. This allows you to customize the image you want to

multicast as needed.

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 three ZfD imaging

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

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