i want to setup an Exchange 2010 DAG cluster with two typical EX2010 installation. both of the servers setup with Hub Transport Role, Mailbox Role inc DAG, and CAS role i made an CAS array of both servers with the DAG Virtual IP address for MAPI traffic it is working correctly, and after SP1 rollup 2 Public folder failover is "working but my main question is, is this an supported configuration CAS array without any method of LB?

That wont give you load balancing though will it? The DAG Cluster IP is referencing only one server at one time so all clients will use the same CAS. As for supportability, I doubt that its supported- specifically - I am referring to using the Cluster IP as a connection point for the mapi clients. If not supported than certainly not recommended though It will work, yes :)

The DAG IP address is for the DAG only, so at a guess I don't think that is a supported configuration. Normally you would point the CAS array at either server, and then change the DNS entry, or put an additional IP address on to the server and then move that in the event of a failover. However this is the first time I have heard of such a configuration, and it isn't something I have seen written anywhere. I can only guess it is working because the IP address is bound to the server. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

That wont give you load balancing though will it? The DAG Cluster IP is referencing only one server at one time so all clients will use the same CAS. As for supportability, I doubt that its supported- specifically - I am referring to using the Cluster IP as a connection point for the mapi clients. If not supported than certainly not recommended though It will work, yes :)

The DAG IP address is for the DAG only, so at a guess I don't think that is a supported configuration. Normally you would point the CAS array at either server, and then change the DNS entry, or put an additional IP address on to the server and then move that in the event of a failover. However this is the first time I have heard of such a configuration, and it isn't something I have seen written anywhere. I can only guess it is working because the IP address is bound to the server. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.