We calculated our ROI to three years and the planned life of the VNX is six years. We are currently in the process of migrating to a new EMC XtremIO SAN, which will have an even shorter ROI.

We have not done any calculations, but the costs we have saved in power consumption, data center space, and cooling cannot be ignored. We went from three full racks of servers, to a half rack (not all EMC, the rest is a Cisco UCS deployment). The savings alone on the three factors above over the past two years have probably paid for this investment already.

It's around 250% over 12 months due to the amount of data that we have.