Novell ZENWORKS LINUX MANAGEMENT 7.3 IR2, Руководство администратора

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348 Novell ZENworks 7.3 Linux Management Administration Guide
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3. At the end of each lab session, assign the Preboot bundle to the lab devices.
4. Reboot each device and let it be auto-imaged by its assignment to a ZENworks Preboot bundle.
28.5.5 Setting Up Devices for Future Reimaging
With minimal disruption to users, you can enable existing devices for possible future reimaging.
This process might need to be phased in by local administrators. Each administrator can do the
following:
1. Install the Novell ZENworks Linux Management Imaging Agent ( novell-zislnx ) on each
device.
2. If the devices are PXE capable, make sure PXE is enabled (see Section 29.6, “Enabling PXE on
Devices,” on page 401 ) and make sure that ZENworks Linux Management is installed on your
imaging server (see Section 29.1, “Preparing a Preboot Services Server,” on page 353 ).
or
Prepare a few sets of imaging CDs or DVDs that users can use when they run into trouble (see
Section 29.2, “Setting Up the Preboot Services Methods,” on page 354 ). These devices should
point to an imaging server that contains the same clean images used for new devices.
3. If a user runs into trouble, use the strategy for reimaging corrupted devices. For more
information, see Section 28.5.3, “Reimaging Corrupted Devices,” on page 347 .
28.5.6 Multicasting Device Images
The following sections explain the multicasting images feature:
Š “Understanding Multicasting” on page 348
Š
“Practical Uses For Multicasting” on page 349
Š “Automatic Multicasting Example” on page 350
For instructions on using multicasting, see Section 30.2, “Multicasting Images,” on page 429 .
Understanding Multicasting
Multicasting is a way to send the same image to multiple devices without sending that image
multiple times across the network. It is done by inviting participants to join a multicast session.
Multicasting is similar to broadcasting on the network, because you send the image once to the
network and only those devices belonging to the multicast session can see and receive it. This saves
on network bandwidth usage.
For example, if you have 10 devices in the multicast session and the image is 3 GB in size, your
network experiences only 3 GB of network traffic to image all 10 devices. Without multicasting, the
network experiences 30 GB of network traffic to image all 10 devices individually.
The devices to be imaged must be physically connected to the network. They can be devices with
existing operating systems of any kind, or they can be new devices with no operating system
installed.
IMPORTANT: For multicasting to work properly, all routers and switches on the network must
have their multicast features configured. Otherwise, multicast packets might not be routed properly.