Hello,
After working hours and hours to stress out the new storage solution Nutanix (Which i advise you to look at because it's really interesting), we found some crucial points i will sum up there :
=> In order to use a large enough file to perform IO on the whole Array, you must resize the second disk of the IOAnalyzer. The whitepaper says to delete the second disk (Used as storage by IOMeter to store the file on which IOs will really be done), using the vSphere client, and then add a new one of the wishing size. However, after that action, you will have to re initialize every workers. In order to do that, log on each worker, and use the webGui to initiate a blank run. Let it endding, and your workers will be ready. (Possible Explanation : After the deletion, the file needed by IOMeter is missing. Doing the blank run create it again.)
=> To use multiple worker, you have to execute the following steps :
=================> Log on the manager worker
=================> Use the webgui (Adding ESX, and configuring the workload)
=================> Log on the other worker VMs too
=================> Launche the stress test
=> You can use the vSphere console to control the lauching of IOmeter : Every working worker will prompt an iometer window.