As to a two-sever pool, interestingly Ive been working with SC at HA-Lizard over the last few weeks and we've come up with a better way (I think) to support a two-server pool. I've done a lot of torture testing and think there will be a more robust implementation in the near future. I'm particularly interested in that we now have several two-server pools and there is no need to expand just for the sake of supporting HA. Stay tuned for more news on this! For HA to work, you'd still of course need shared pool storage.