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Hi - as you can see in your results the xdisk tool with 1 MB block size drove the V7000 up to 3.4 Gigabytes per second.
The reason I mentioned using 0x40000 for the hdisk max_transfer is because...

I re-wrote my ndisk64 script to use xdisk so after creating the 10 files you can run this:

Run(){
xdisk -f f1 -OC -r 100 -R0 -b 1m -t 20 -M 4 -V
xdisk -f f1 -OC -R0 -b 1m -t 20 -M 4 -V|tail -1...

As an alternative can you use the ndisk64 tool (part of the nstress tools from Nigel Griffiths)

Do a web search for "nstress" and download the tar file from the IBM wiki site.

In the /usr1...

Can you change the hdisk max_transfer size from 0x80000 to 0x40000 and re-test? You will have to unmount the filesystem, varyoff the VG and run the chdev command.