What tests besides iometer might you want me to run To-M or anyone else?

I am running a dual quad core intel server with 16 GB of RAM for Hyper-V

My virtual machines are on a 4 x 750 GB drive RAID 10 array running on an Areca 1160 PCI SATA II Controller. My Open-E box is a dual core Xeon with 2 GB of RAM with two nics bonded in balance-rr running in 32 bit mode.

Currently the LUN I am using is running Block I/O.