ESXi 5.1 MD3220 SAS HBA load balancing

We have 2 controllers on MD3220 and 2 dual-port SAS HBA on R820.  

We connect port 1 of HBA 1 on R820 to port 1 of RAID controller 1 on MD3220.  

We connect port 1 of HBA 2 on R820 to port 1 of RAID controller 2 on MD3220.

On ESXi, both ports shows "Active" but only one shows "(I/O)".  So, it looks like only one port is being used.  Can we do load balance on these where both ports are used simultaneously?

Thanks!

ph