Weirdly all my experiences of Orchestrator have been confusing and well I just don't get on with it, If you know of any good intros/tutorials I would be happy to try it again.
My intention for this however was to use PowerCLI to do the following
Turn on SSH/Root Access to the Host
call plink to login to the host via ssh
run the vmkfstools command for each Datastore via plink
Turn off SSH/Root Access to the host.
I'll probably add something to report the datastore usage (at the SAN Level) before and after aswell.
Brett