MSA 1000 & SQL Clustering - Best Practises

[CA1369525]

We currently have a customer with a SAN that has two MSA1000 controllers in it configured in an active - passive pair. This SAN has two shelves configured with 146GB disks in it. We would like to add another shelf onto this SAN What we are wondering is what would be the best way to configure the SAN with these 3 shelves to get the best performance for two SQL clusters that need to connect to it. We are thinking of using RAID 1 + 0 to configure the arrays for best performance but what we're not sure on was how best to arrange these across the shelves for best read/write performance?