HP Multi-Site Traffic Director sa9200 - Manual (Page 46)

C H A P T E R 4 HP Multi-Site Traffic Director Server Appliance SA9200 User Guide
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• Flash Response Mode
• Mixture of Brokered and Non-brokered Sites
• Different Site Combinations for Each Hostname
• Different Balancing Methods for Each Hostname
• Associating Services with Hostnames
Procedures
NOTE: HP Traffic
Director refers to either
an HP Traffic Director
Server Appliance, Models
SA7200 and SA7220; or
HP e-Commerce Traffic
Director Server
Appliance, Models
SA8200 and SA8220 Step 1. Create agents for each of the sites brokered by HP
Traffic Directors 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 SA9200-to-site association is also done at this time since at least
one Web site uses Flash Response Mode. The HP Traffic Directors
are used as the backup Flash source.
In this scenario, only two of the four sites SA9200s are actually
required. If Flash Response Mode is used, the Traffic Directors can
broadcast the DNS responses under the direction of the SA9200s. The
Traffic Directors may have an impact on performance, so it is
recommended that a SA9200 be placed at each site and the site
Traffic Director designated as a backup Flash source. This prevents
the SA9200 from being a single source of failure without impacting
the performance of the Traffic Director except upon a SA9200
failure.
Since redundancy is a key issue, all of the Traffic Directors are
deployed in pairs with serial failover enabled. This means that each
Traffic Director actually has three IP addresses. The IP address that
is used to communicate with the SA9200 is the Online Outside IP
Address (management address). This makes the failure of a Traffic
Director transparent to the SA9200 except for a momentary loss of
connection that provides the Traffic Director metrics.