CAS clustering ?

[Kothari, Amit]

Greetings everybody,
 
We are evaluating CAS for SSO-enabling our applications. Is clustering of CAS servers possible ?
To avoid excessive server load during high volume of authentication requests, we plan to setup multiple CAS servers to handle authentication requests.
Let's say our applications (cas-client)  and CAS servers will be configured like this:
 
Users redirecting to App1, App2 will be authenticated by CASServer1.
Users redirecting to App3 will be authenticated by CASServer2.
Users redirecting to App4 will be authenticated by CASServer3.
 
Once a user gets authenticated by any one CASServer, the user should be able to browse any other application protected by a different CASServer.
E.g: Once user1 gets authenticated by CASServer1, user1 can successfully browse App1 and App2. So far so good.
Requirement --> user1 should be able to browse App3 and App4 without being authenticated. 
 
Is this possible ? Has anybody tried something like this before ?
We are using Tomcat 5.0.x for CAS server & client deployments. CAS Server --> 3.0.4 and Yale CAS Client --> 2.0.11
 
Since CAS server 3.0.5 supports distributed ticket registries, can we use 3.0.5 ? How much code /configuration will be needed to achieve the desired functionality ?
I couldn't find any documentation about enabling distributed ticket registries. Any pointers will be appreciated.
 
Thanks in advance,
 
- Amit
 
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