First thing is to do is to send the All Events filter to nDepth. This will give you the number of events per 10 mins. TImes that by 6 to give you the number of events per hour. Check the LEM scalability guide. Events/hour < 1.3 Million then 2 CPUs, 8GB memory. Events/hour <8.3Million then 4-8 CPUs and 16-24GB memory, Events/hour < 16.7Million, then 8+ CPUs and 24-48GB memory.
Amit Shah
Loop1 Systems