This will only work once a host has been added to Vcenter.
Use Vmware CLI to run this with the variables in Square Brackets edited out
This will change from Multipath to Round Robin
Connect-VIServer [VCENTER-SERVER-ADDRESS]
$hostview = Get-View -Viewtype HostSystem –filter @{“Name”=”[Fully qualified name of server]”}
$storageSystem = Get-View $hostview.ConfigManager.StorageSystem
$policy = new-object VMware.Vim.HostMultipathInfoLogicalUnitPolicy
#$policy.policy = "VMW_PSP_MRU"
$policy.policy = "VMW_PSP_RR"
$storageSystem.StorageDeviceInfo.MultipathInfo.lun | foreach { $storageSystem.SetMultipathLunPolicy($_.ID, $policy) }