Hi Sergio,
There are many people more knowledgeable than I am on this topic, and I hope 
they contribute to this interesting question. My two cents would be to remember 
that the TSM database doesn't know about an array replication, so you'll have 
to deal with that issue if you have a massive recovery event. My other two 
cents are that to be certain sure that whichever solution you choose works as 
described. You can't test the alternatives enough.

Best wishes,
Keith Arbogast
Indiana University