As I'll be using routed mode, I assume I'll need three vlans. One for the client side, one for the web tier and to provide a natpool and the third for the app tier and again to provide another natpool so that traffic from the app tier goes back through the ACE to the web tier. Is this correct?
You could do everything in one context. I have a similar setup and I used multiple contexts in order to keep the individual configs smaller and simpler, large configs on the ACE can get complicated and ugly:) I set up the following:
APP-PROD and APP-NON-PROD non slb segments off FWSM, APP-LB-PROD and APP-LB-NON-PROD slb segments using ACE contexts. This gives app owners flexibility to use load balancing or not in parallel tiers.
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