We have a load balancer (Centos 5.2 + heartbeat + ldirectord) with 800 virtual services. It directs traffic to a farm of tomcat servers, MySQL database servers, Windows terminal servers, and FTP servers. The load balancer computer in question is a 2 x dual-core Xeon 2.4GHz box with only 1GB RAM, but it is not working hard. CPU utilization is consistently below 25%. Recently we have started receiving complaints from a small subset of users who are experiecing application freezes when retrieving files via FTP. It appears that what these users have in common is that they are using passive FTP. Is possible that LVS might have problems with passive FTP when there are a lot of simultaneous connections to track?
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