HP Multi-Site Traffic Director sa9200 - Manual (Page 39)

C H A P T E R 4 Scenario 1
33
HP SA9200/config/dns# save first-cfg
Configuration saved
HP SA9200/config/dns# commit all
Warning: Your active configuration will be
overwritten.
Are you sure you want to commit the
configuration (yes|no) ? yes
Configuration has been committed
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
Procedures
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. If 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 SA9200s 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 SA9200 has some built-in features that make this transition
almost as simple as the first method. In this section, the SA9200 is
used to take sites offline (no new referrals) to add a load balancer at
each site.