Thanks for the analysis jgmke, They are definitely SSD drives:-
Attachment:
ssd.PNG [ 145.56 KiB | Viewed 8082 times ]
I do have some positive progress to report, I changed the interconnects for Synergy to Switch to the 'correct' QSFP's and fibers this morning. It has made a big difference to latency. I also have IOmeter up and running now and you can clearly see on the graph below once the IOP's are ramped up the latency goes down to the sort of figures we were hoping/expecting to see.
Attachment:
iops.PNG [ 125.95 KiB | Viewed 8082 times ]