Hi Prabhu
I see that you are currently using two physical Server with more horsepower than the mix of 4 Blad Server Chassis, it is an example of a Cisco Blade Server Chassis component and display architecturesand how it looks like I believe : http://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-b-series-blade-servers/spec_sheet_c17-644224.pdf.
I believe you need to remember that all the resources are imporntant you we are planning a heavy Performance Test. It is also depends on what type of Peformance Test you are trying to execute. There are some types such as:
Load Testing.
Stress Testing
Soak Testing.
Spike Testing
Configuration Testing
Isolation Testing
Also we need to know how complex are the JavaScript Asyncronous callbacks and how they play its roles during the execution. We need to reduce number of Vusers per Host, it means you may need to do a ramp up of vusers on Controller Scenario. We need to check if the server have
another processes being used, we need to discard or end the process that we do not need during the Load Test( for the 2 Host machines).
May you please let us know how many procotols are you using? Also What are the protocols being involved during the test, you can create a list of them?
Knowing the protocol we can find the possible causes that are producing this. Another recomendation is to redesign the script or scripts to ensure that it is run as separate iterations rather than repeatedly looping in a single iteration. This will ensure that memory allocated during the script iteration is released and thus prevent a memory leak occuring.
Kind Regards,