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C H A P T E R 4Intel® NetStructure™ 7190 Multi-Site Traffic Director User Guide
38
• Different Site Combinations for Each Hostname
• Different Balancing Methods for Each Hostname
• Associating Services with Hostnames
Procedure
Step 1. Create agents for each of the sites brokered by Intel
load balancers and associate their services.
For this example, there is one existing site used for only one
division’s Web site. This site enforces the fact that not all sites have
to be identical.
The 7190-to-site association is also done at this time since at least one
Web site uses Flash Response Mode. The load balancers are used as
the backup Flash source. In this scenario of four sites only two 7190s
are actually required. If Flash Response Mode is used the load
balancers can broadcast the DNS responses under the direction of the
7190s, but using the load balancers may have an impact on
performance, so it is recommended that a 7190 be placed at each site
and the site load balancer designated as a backup Flash source. This
prevents the 7190 from being a single point source of failure without
impacting the performance of the load balancer except upon a 7190
failure.
Since redundancy is a key issue, all of the load balancers are deployed
in pairs with serial failover enabled. This means that each load
balancer actually has three IP addresses. The IP address that is used
to communicate with the 7190 is the Online Outside IP Address
(management address). This makes the failure of a load balancer
transparent to the 7190 except for a momentary loss of connection
that provides the load balancer metrics.