[LTM] Select monitors

Hello,

I would like to monitor a pool of 2 members with 4 different monitors. So far nothing tricky. Here are my current monitors :

• MN_tcp_3000 : TCP Handshake on port 3000
• MN_http-gif_60s : HTTP monitor on port 80, that checks the existence of a gif file every 60s (interval)
• MN_http-gif_90s : HTTP monitor on port 80, that checks the existence of a gif file every 90s (interval)
• MN_http-gif_120s : HTTP monitor on port 80, that checks the existence of a gif file every 120s (interval)

I want the monitors to mark the node down if MN_tcp_3000 is down or if every single one of (MN_http-gif_60s, MN_http-gif_90s, MN_http-gif_120s) is down.

My problem is that I cannot use the Availability Requirement setting to put for instance At least 2 monitors, because if 2 of the gif monitors were up and the TCP_3000 monitor is down, then the nodes would be marked UP.

Is there a simple way to do that (iRule to select monitors) ? Or should I write a custom external monitor for that ?

Thanks, Paul