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You now have a fully operational Infinit.e cluster. Start adding sources and you can begin analysis. This link provides a quick example of getting a source imported in order to test/demonstrate the GUI.
It takes about 20 30 minutes for a node to come online following start-up. Most of this time (1020-15 25 minutes) is spent updating the packages (like Java and JPackage) from the defaults on the CentOS 5.5 AMI. Therefore the time-to-start could be significantly improved by building a new custom AMI, starting from the base AMI, installing infinit.e-prerequisites-online RPM, and then creating the new AMI (we used that link to generate this script file on github).