Thanks Steve/Chris, I’m running 10.9.4 and put MTU to 9000 (auto speed select), but still max speed 200MB/s. Do you have good results with 10G Base-T version of SANLink2? Then maybe something else is causing this poor performance.
I also contacted Promise, but they are saying the SANLink2 is only for use with their storage. I have a Netsor storage with an Areca controller, Myricom NIC en a Netgear 10Gbe switch.