I have three hosts with X520-DA2's in them (1-SLES10sp4 and 2-VMware ESXi 5). I have connected them to an HP Procurve E5412zl (J8698A)switch with a 10G module (J9538) and an HP direct connect cable (J9285B). I am unable to get communication to cross the wire from the hosts to the switch.
Is the HP SFP+ connector that is on their direct connect cable compatible with the Intel X520-DA2?
If compatibility is not the problem, what has to be done to get these two to communicate?
There was an update to the Intel Ethernet drivers to fix an incompatibility with the J9285B and similar cables. I suspect that you are encountering that issue. Updating the drivers will be a good next step.