# File lib/deltacloud/drivers/vsphere/vsphere_client.rb, line 94
    def list_virtual_machines(credentials)
      vsphere = new_client(credentials)
      vms = []
      rootFolder = vsphere.serviceInstance.content.rootFolder
      rootFolder.childEntity.grep(RbVmomi::VIM::Datacenter).each do |dc|
        list_datastores(dc.datastoreFolder).each do  |datastore|
          vms += datastore.vm.collect { |vm| { :instance => vm, :datastore => datastore.name } unless vm.nil? }
          stored_tasks(datastore, vsphere) do |task|
            if task.info.entity.class == RbVmomi::VIM::VirtualMachine
              vms << { :stored_instance => load_serialized_instance(datastore, task.info.key), :datastore => datastore.name }
            end
          end
        end
      end
      vms.flatten.compact
    end