How do i know how many Virtual Servers my LTM can support at the maximun.

Edouard, First, there is no technical limit to the number of virtual servers you can have on any platform. With that said, at a certain point the WebUI starts to become slow and eventually unusable if the config grows too big. Two things will affect the amount of virtual servers your LTM can support; CPU speed and number of configuration objects.

Most platforms can easily handle 20000 config objects. Each virtual server will likely have a pool, a couple of profiles, maybe SSL profile, nodes, etc. So one virtual server will likely include 5 to 7 total config objects. Divide 7 by 20000 and you're looking at about 3000 virtual servers. however, the more config objects the longer it takes to save the config each time you make a change.

Larger platforms like the 5200 and above can handle much more, 100,000 - 150,000 config objects. But again, it may take 30 seconds or more to save the config each time you make a change.

Also, note that the size of the config does NOT affect data plane traffic. Hope that answers your question.