Venkat, in AA env, if you expect a lot of traffic to the app server, definitely you would need to consider adding more webengines to the app server. I can see the pros as more workload can be handled and the cons? you may need to
consider the following:
--more network bandwidth from the app server to the database server and between the bg server with all app servers
--more app server resources would need
--the end users now have two urls to access the app--pdmweb.exe and pdmweb1.exe(assuming you add another webengine)--and end users may just go to the first one as you used to be, though you tell them to use the second
one. So you may need to add a webdirector and publish its url as pdmweb_d.exe for all webengines
I am sure there should be more out there so hope others add to this discussion. It is a very good one. Thanks _Chi