How are you going to decide Server1 is down and then shift the messages to Server2? We cant ask the sending system to maintain two set of objects...one pointing to Server1 and other to Server2.
We can maintain 2 Servers and we can make the other one active during the outage. We can create the objects for the other server too and call them dynamically as the alternative during outage?
Generally a web dispatcher is used to see the load on a server and route it to another less load server. So all the request from the sending system shoudl be directed to this web dispatcher and from there to the appropriate server. You can also make use of this concept and route the messages to one server (irrespective of the load) and when it is down/unavailable route it to the second server.
I would suggest you to read the High Availability document for PI (available from market place )
Are you looking for load balance or some cluster thing...or
want to expose the servers to outside network...DMZ...in this case yes ...
if you are looking for load balance... then two nodes can be created in the same server...but needed more memory in the server...
if you want to expose to the outside netwrok people for exchaning data..then need to maintain one in DMZ..and other in with in network..which does the application processing..
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