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The hub servers are located near important directory-enable applications such
as a mail server or a web server.
Hub servers remove the burden of replication from the supplier servers, so the
suppliers can concentrate on doing write operations. In the future, as
expands and needs to add more consumer servers, the additional
example.com
consumers do not affect the performance of the suppliers.
For more information about hub servers, refer to "Cascading Replication," on
page 121.
Supplier Architecture
For the
example.com
uses database links to chain to the data of other localities. For the master copy of its
data, each locality uses a multi-master replication architecture. For example, the
supplier architecture for Europe, which includes the
information, appears as follows:
dc=com
Figure 9-13
Supplier Architecture for example.com Europe
intranet, each locality keeps the master copy of its data and
A Multinational Enterprise and Its Extranet
dc=exampleCorp,dc=com
Chapter 9
Directory Design Examples
and
205
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