Eco4Cloud is being used by our VMware Competence Center in all our VMware farms. The clusters in these farms are generally based on a number of servers that is usually higher than the number of hosts actually needed to run the hosted workloads. Eco4Cloud evaluates the total workload of each cluster and determines if there's a chance of emptying one or more hosts. It then instructs vCenter to vMotion the VMs on the least number of hosts and then tells vCenter to put the empty hosts in stand-by mode. When first installed, Eco4Cloud turned off as much as 20% of our hosts, obtaining an interesting reduction in power consumption. It also caused a delay in our hardware investments because we then directed our new workloads to the clusters that had more that one host in stand-by. When we finally needed to buy new servers and created new clusters, Eco4Cloud kept only two hosts running in each new cluster until we added workloads that caused a third host to start and so on with the following servers.