We have 2 identical (as far as we can tell) apache servers in a load balanced configuration. The servers are behind a hardware load balancer. One of the 2 servers, during periods of relatively high load, routinely exhibits 50% higher process counts than the other server.
The obvious culprit would be a misconfiguration of the load balancer, but the amount of traffic that each server sees is nearly identical (<1% different). The server statistics (cpu utilization) are identical or nearly identical as well.
Apache configurations (the /etc/httpd directory) are identical as well. I suspected a longer tcp timeout on the one server but the thresholds are identical.
What other factors could be contributing?