Performance of high availability and load balancing example

Hi,
I wanted to use the High Availability and Load Balancing Setup that
you were describing for the Amazon EC2 cloud. I believe it should work
if I have outside at my custom ISP two instances that act as the
directors. They would be in the same physical network. (does anyone
have experience with that?).

As far as I understand, it makes no difference that the real servers
are at a geographically distant location in a separate network for
this setup. However, since I cannot use the virtual IP inside the EC2
cloud (since it is in another physical network), I would have to route
the traffic back through my directors. How many of these "sessions"
can each director handle? I am aware that this depends on the
application, but are there some numbers out for a normal portal or an
Ajax site? Could someone who has this setting give me an approximation
of what his system handles currently?

Thanks,
Flo


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