MACROMEDIA COLDFUSION 4.5-ADMINISTRING COLDFUSION SERVER Manual page 266

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Configuring session-aware load balancing
Sometimes referred to as a "sticky" session, session-aware load balancing guarantees
that users won't get bumped from the server on which they started their session until
the session is complete, regardless of the load thresholds that have been defined for
the affected server.
Note
To configure session-aware load balancing:
1. Open ClusterCATS Web Explorer if it's not already open.
2. Click the Show Cluster link.
The Show Cluster page appears.
3. Enter the fully qualified host name of the server for which you want to configure
session-aware load balancing in the Web Server Name field and click OK.
The Cluster Member List page appears.
Session-aware load balancing may not work if you've used absolute
hyperlinks in an application page. Absolute hyperlinks route the HTTP
request back to the cluster entry point and redirect requests according to
the current load threshold without regard to the state of the requesting
client. To avoid this inadvertent loss of state, be sure to use only relative
linking in your application pages.
Administering ColdFusion Server