[f-nsp] serveriron XL loadbalancer using 100% cpu

[David Morehead]

My company recently purchased a serverironxl loadbalancer (16 ports with 
1 gigabit fiber port) we attached 16 webservers to the device and setup 
the virtual and real servers appropriately everything was running fine 
with the servers running stand alone no loadbalancing. Once we changed 
dns to use the loadbalanced ips the cpu went to 99% and download speeds 
decreased significantly. It was pushing about 700 mbits before 
loadbalancing was turned on after we started using the load balancing 
traffic went down 30%, there are a few hundred websites running on all 
these servers.

So im wondering if this is just to much for the device to handle? I 
would think it should not be a problem for it but im no expert. we have 
another server iron pushing over 780 mbits but with fewer sites behind 
it. So could it be the large number of sites overwhelming the device? 
its running firmware ver Version 07.3.05T12

thanks in advance for any help
dave