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I still dont see point in CDN services,i mean it's bandwidth is much more expensive compared to classic one yet what does it do,it simply direct user to server with best response.If my goal would be to provide best possible connection for user,then i would do following:
1.Identify from where most of users are coming -
If they coming mostly from usa and west europe,then i would take one ordinary server in west cost datacenter,one in east cost datacenter,and one in Amsterdam or London(again depend from which part of europe most of users coming,if there is more users from uk then london,if more from germany/france/etc then amsterdam)
2.Then once i would get all required servers,to install geo proxy on httpd level,where once user is detected from where he is coming,it would be proxied to correct server.This would not be good just for geo purpose,if you use proxy program like nginx or haproxy it actually help on reducing bandwidth usage and server load as well.
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