Throwing my two cents in here mostly to rile Bob.
I have run Apple LSI fiber cards on 10.10 without any problem.
Also, this is an industry trend and just a penny-wise pound foolish one where spending nothing is a lot better now, even if one has to spend twice as much as they might have otherwise spent in the future.
I have had a few issues with 4GB fiber channel and am being told it’s due to my antiquated LSI Apple fiber cards. I have some tape drives for LTO archiving I use and while I don’t need the throughput of 8GB fiber, that is what it might come to. From someone who doesn’t want to spend the money and wants to hold out as long as possible to see if there is a better move, this is a predicament: do I potentially get rid of my issues by investing in some new cards at $1.2k a piece or do I wait it out until I’m forced to upgrade? I’m sure it’ll tickle you even more to know that I have all of this running on an Xserve 2006.