Load Balancing Multiple pool members

By using a non static global variable (in RULE_INIT), you have demoted your virtual to run on only one CPU. In other words, you have disabled "Clustered Multi Processing (CMP)" for that virtual.

Try using "table incr" and "table lookup" commands instead.

iRule table commands

to increment and lookup use:

    set active_connections [table incr "connections"]
    if {...}


when CLIENT_CLOSED {
  table incr "connections" -1
}