Based on this question: http://serverfault.com/questions/124905/widely-used-load-balancing-solutions, LVS may be the right solution for my problem.
But when I went to its homepage http://www.linuxvirtualserver.org/, I found that LVS has been updated since Nov, 2008. The world's moving fast, and I don't know if LVS was obsolete or not.
Is LVS standing still, or there're some better solutions to replace it?
Thank you so much.