Novell ZENWORKS LINUX MANAGEMENT 7.2 IR2 - ADMINISTRATION GUIDE 09-25-2008, Руководство администратора

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328 Novell ZENworks 7.2 Linux Management Administration Guide
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Relationship: This defines the relationship for a filter between the Device component field and
the value you specify for it.
Possibilities for the
Hard drive size and RAM fields:
< (less than)
> (greater than)
= (equal to)
>= (greater than or equal to)
<= (less than or equal to)
<> (not equal to)
Possibilities for all other device components:
Contains
Equal To
Starts With
Š
Component value: This corresponds to the match you want for the component. For example,
you select RAM (in MB) for the filter and enter 512 for its value. Then, the relationship you
select determines whether it’s less than, less than or equal to, equal to, not equal to, greater than
or equal to, or just greater than 512 MB.
You can have multiple filters and sets of filters in a single rule, using the AND and OR operators,
and you can have multiple rules associated with the same Preboot bundle. This allows you to specify
exactly to which devices a particular Preboot bundle can be applied.
For the procedures in configuring work assignment rules, see Section 29.4.4, “Configuring Preboot
Work Assignments,” on page 377 .
28.3.6 Preboot Referral Lists
When a PXE device boots, it makes a broadcast request on the network for PXE services. The
ZENworks Proxy DHCP server (novell-proxydhcp) responds to this request with information that
includes the IP address of an imaging server where the device can send requests for assigned preboot
work.
It is essential that the PXE device contact PXE services associated with its home zone so that it can
correctly determine if there is any preboot work assigned to it. When there is only a single
ZENworks Management Zone, this is fairly easy to do because all Proxy DHCP servers provide
addresses to services that belong to the same zone. Any device can request preboot work from any
imaging server in the same zone and get the same response. However, when multiple ZENworks
management zones exist in the same network, things become more difficult, particularly when each
zone has its own set of PXE services.
The PXE device’s initial request for PXE services is sent as a broadcast to the network, and all
Proxy DHCP servers respond with information pertaining to their respective zones. Because it is
impossible to determine which Proxy DHCP server responds first, if multiple Proxy DHCP servers
respond, or which response is used by the device, it is impossible to ensure that each PXE device
will contact servers in its home zone.
A Preboot Referral List allows you to ensure that all devices contact their home zone for preboot
work assignments. The list should contain the IP address of an imaging server in each known
ZENworks management zone. When a device requests preboot work from a server, the server first