Mongrel cluster

Hi,

i have deployed 3 mongrels on three differnet app servers. up front i have an apache with mod_balancer. Do I have to use the database as session storage, or is there some mechanism to forward a request for a certain session to a certain server? I have been using Java before and I wonder if there is something like a mod_jk for apache/tomcat to control the load balancing via a sessionid attached to the url?