how work ip_hash and weight in nginx 1.2.7

[moke110007]

sorry,my english is poor.
>>>
webserver: tomcat 6.0.23
When I tested on four tomcat servers, one server load is higher always.How
to set up to make each server load is balanced.
>>>
Use weight to decide load distribution, iphash to decide the next should be
assigned to which server.

Thanks!

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,236972,236972#msg-236972