esxi 4.1 not using all 4 ports

Hello,

We have 3 servers with 8 NIC's dedicated to iSCSI and connected to a MD3220i. I have explained the setup in a different if someone is interested threadhttp://en.community.dell.com/support-forums/storage/f/1216/p/19515658/20407337.aspx#20407337 

Basically, all ports have different IP's and 4 subnets. In esxi, I can see 4 Active (I/O) paths for each LUN. 

When I generate the iscsiStatistics.csv, it shows that a majority of IO is happening on Port 0/1 of each controller.

iSCSI Host Port	TxS	TxB

RAID Controller Module 0, port 0	256	28944
RAID Controller Module 0, port 1	4	144
RAID Controller Module 0, port 2	0	0
RAID Controller Module 0, port 3	0	0
RAID Controller Module 1, port 0	502	2880
RAID Controller Module 1, port 1	687	144704
RAID Controller Module 1, port 2	2	48
RAID Controller Module 1, port 3	26	144

Any pointers on what to look for? I have not manually changed the ownership of LUN's. Left it as default what the array assigns.

Thanks