GTM load balancing dilemma

I have an architecture where a GTM is load balancing a service between two data centres. The GTM uses iQuery to communicate with the LTMs in each data centre.

 

 

Now, the main Virtual Server on the LTMs passes traffic through some HTTP classes and ASM - but the key point is, the VS doesn't have a default pool specified for security. This means that the VS doesn't have a health status i.e. it is a blue square. This has implications on the GTM - it doesn't know if the VS is really there or not. What it can establish, however, is the number of connections to each VS and therefore intelligently load balance between the data centres.

 

 

What I have tried is to create a dummy Virtual Server that has a default pool containing the same web servers as the product VS, but listening on a dummy port. This doesn't affect the GTM of course because that only cares about the IP address. The problem now is that this method tells the GTM the availability of the data centre but NOT the number of connections!

 

 

Can anyone suggest a way of getting all the information at the GTM so that it is aware of both the connections and availability?

 

 

Thanks, Keith