If you would have read the link I posted earlier or did some googling youself, you would easily have found it yourself.
Anyways, the basic command is:
esxcli nmp roundrobin setconfig --type "iops" --iops=X --device Y
For switching paths every X IOPS on device Y.
You should check with your storage vendor if that is actually recommended. HP for example recommends it in their whitepaper.
--
http://alpacapowered.wordpress.com
