Server Clustering : USA Server and Asia Server

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http://serverfault.com – I need to implement Server Clustering between USA Server and Asia Server. Is there any IPLC (international private leased circuit) needed? or Only internet connection is enough? I have two server, one at USA and another at Asia. Both are CentOS based server. I don't need CDN, just Server Clustering (File + Database). Edit : My DB is MySQL, File System is ext3, and i need Load Balancing + Traffic Direction (HowTos)