I'm developing an architecture model for my company's global SharePoint footprint and have a question on the people search experience for a geographically distributed model. My plan right now is to have a local farm in each region (Americas, EMEA, and Asia) including a My Site web app set up as the trusted location for each region. My plan for search on "regular" content was to set up a federated search to the other 2 farms for each region, but I don't know how that works with People Search results.
Do I need to crawl the My Site applications for the other 2 farms from each region to have people's profiles show up in People Search? Are the profiles distinct enough from My Sites that if I do a full profile synchronization on each farm that will feed the people search results? Would people search results show up as part of the federated search?
Thanks for any help. I don't have the environment up yet to properly test this to determine the answers myself.