Yeah, that's nice and all, some random guy did some random thing on the Internet and others followed. Sorry, I'm tired of dealing with that. As the URL notes, "this might help." But that also means "this might not." And I'm leaning towards "not" as the Qlogic based card isn't a common choice.
One of the things about hardware is that it's nice to believe that any random P.O.S. card will work, will work great, and you'll love it and never have any problems with it. Many years of professional experience with PC hardware leads me to believe that such beliefs bear no resemblance to the truth, and therefore I am a huge fan of using the known-tested-proven-good hardware that is suggested here in the forums. You *can* pick some random technology to attach your hard disks, but you'll be your own guinea pig in most cases. We know that the LSI HBA's with a particular version of firmware are problem-free and have billions of aggregate run-hours to back that up. We know that certain Intel and Chelsio network cards are problem-free. Etc.
Basically if you want to do 10G networking with FreeNAS and you want a competent starting point, forget everything else you've heard, and go to the first post in this thread. Most of the best information about 10G especially with respect to FreeNAS lives here in this thread. You might be able to get it to work on other random 10G cards. This will have to do with who wrote the driver, how well it was written, whether or not the author had access to chipset docs, whether the chipset had any bugs, and how well various arcane features such as vlans, hardware offload, jumbo MTU, etc., work. There are a number of us who do this professionally and there is fantastic knowledge collected in this thread.
The upside to a network card is that if it ends up causing problems, you can pull it and give it a tap with the magic fix-it wand
. Then you can go out and buy an Intel X520 or a Chelsio. So the Qlogic isn't a catastrophe. If it turns problematic, remediate it.
That's very different than drive-to-host attachment, where a poor choice of attachment can land you in a world of data loss pain, and there isn't any turning back from that.