Use iRules to query number of active connections against a node

Not sure what you're looking for here.

• The client connects to the virtual server
• Instead of a pool you have a group of host names you use
• For each request the client makes you want to choose the hostname with the least connections, resolve it again, and send the request to the resolved.

Is this correct? If it is you're looking at additional latency for every query and I believe overhead in terms of new tcp connections for every request (unless you're using NAT and can re-establish only the server side connection). But I guess you're aware of that already? :)

/Patrik