With Topobase Web 2008, it is possible to use the pragmatic load balancing feature (similar to 6.5).
the difference is that once a session is established, you are linked to that server for the session i.e. if you log into Topobase Web, you will be working with the same server till you log out. The next user however might be redirected to the available server if the first one is in use.
Here is how you would set it up.
The default web tier configuration file, webconfig.ini contains the following settings (comments have been removed for conciseness):
[AdministrativeConnectionProperties]
Port = 2810
[ClientConnectionProperties]
Port = 2811
[SiteConnectionProperties]
IpAddress = 127.0.0.1
Port = 2812
To set up the web tier to access two site servers, with ip addresses 111.111.111.111 and 111.111.111.222 using the standard ports, only the IpAddress setting needs to be modified:
[AdministrativeConnectionProperties]
Port = 2810
[ClientConnectionProperties]
Port = 2811
[SiteConnectionProperties]
IpAddress = 111.111.111.111,111.111.111.222
Port = 2812
It is also possible to use different port settings for each server. So if server 111.111.111.111 uses the standard ports, and 111.111.111.222 uses 2820, 2821 and 2822, the settings should look like this:
[AdministrativeConnectionProperties]
Port = 2810,2820
[ClientConnectionProperties]
Port = 2811,2821
[SiteConnectionProperties]
IpAddress = 111.111.111.111,111.111.111.222
Port = 2812,2822