How would I trouble shoot a bottleneck when copying files to my iSCSI SAN.

Netware 6.5 SP7
iSCSI Ver 1.06.03
Gigabyte Ethernet for the iSCSI
Winsock 2.0 ver 6.24.01

I was hoping SP7 would fix this problem of Current Disk Request Bottleneck but it didn't and I have to get my SAN Storage working.