I am looking for a way to set Round Robin as the default setting for my data stores.
Round Robin is experimental in ESX 3.5 and fully supported in vSphere ..
what version of vmware are you using???
I am using vSphere 4.0 with vCenter 4.0.
I don't know how to set RR as the default, but it is possible to script the setting of all storage of a particular type to using RR - I'll see if I can dig up a rough sample for you to start with, but for now here is an outline from memory:
list= use "esxcli nmp device list" to get a list of all devices, use awk to limit it to certain devices, eg exclude local disk
for item in list, do
esxcli nmp device setpolicy -- device $item RR
done
But, yes, I suspect there is a way of setting RR as the default for all new storage devices.