I am looking to code a file storage application in perl similar to amazon s3. I already have a amazon s3 clone that I found online called parkplace but its in ruby and is old also isn't built for high loads. I am not really sure what modules and programs I should use so id like some help picking them out. My requirements are listed below (yes I know there are lots but I could start simple then add more once I get it going):

• Easy API implementation for client side apps. (maybe RESTful but extras like mkdir and cp (?)
• Centralized database server for the USERDB (maybe PostgreSQL (?).
• Logging of all connections, bandwidth used, well pretty much everything to a centralized server (maybe PostgreSQL again (?).
• Easy server side configuration (config file(s) stored on the servers).
• Web based control panel for admin(s) and user(s) to show logs. (could work just running queries from the databases)
• Fast
• High Uptime
• Low memory usage
• Some sort of load distribution/load balancer (maybe a dns based or pound or perlbal or something else (?).
• Maybe a cache of some sort (memcached or parlbal or something else (?).

Thanks in advance