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C H A P T E R 4Intel® NetStructure™ 7190 Multi-Site Traffic Director User Guide
32
Part 3 –
Adding Load
Balancers to
an Existing
Site
Key Concepts:
•
Adding a Load Balancer (Agent)
• Disabling a Site
• Mixture of Brokered and Non-brokered Sites
• Configuring for Future Expansion
• Deleting an ISV Group
• Adding and Deleting Services
After the sites have been up and running for a while it is still easy to
change the configuration to add new servers, services and hosts. But
if the site data traffic increases significantly it is often advantageous
to add load balancers to manage the traffic to the Web servers. Done
correctly, the addition of a load balancer at a site can be handled with
minimal service interruption.
There are two methods to handle this transition. The first method
requires that all existing network addresses be kept in place. The
7190s would continue to refer clients directly to the servers until the
configuration changes are committed. The second method assumes
that addresses of the servers might change. The act of changing
network addresses of servers usually entails taking a site offline while
transitioning.
The 7190 has some built-in features that make this transition almost
as simple as the first method. In this section, the 7190 is used to take
sites offline (no new referrals) to add a load balancer at each site.