I've been having many serious problems with HP nc522SFP 10gig nics. I have 10 of them in my prod. environment and have issues from nic status flapping (up,down,up,down) to just flat out dropping all NFS stores and crashing vms.
I want to know what nics people have had the most success with. I'm looking for a dual port 10 gig card that supports twinax cables and jumbo frames. header, checksum etc offloads are a plus. currently looking at the intel X520-DA2 cards.
thanks!