Yep, I've seen that in a couple of cases -- even in cases where it wasn't proven that the hardware/driver was the problem, just suspected. Rip out all the cards and replace them with something we know works (or the 3rd party application vendor supports, whatever).
Replacing a half-dozen fibre cards (HBAs) is cheap compared to what you're paying your SAN vendor, and if he says that card X isn't supported (by him) under the OS upgrade you want to do (or your DB vendor insists on) but card Y is, guess what's going to happen.
(And in this particular case the drivers for both X and Y cards were GPL, so that wasn't even a factor.)
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