Greetings,
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Upstream has also "abandoned" a significant number of hardware RAID cards and network cards in EL7. I have a few HP Proliant 64-bit servers that are about 6 or 7 years old... and the RAID card isn't detected in 7 where it was in 6. I've heard a few other people mention the same thing with regards to their NICs.
What's the model? If you say "Promise", I don't blame upstream. Those things were *horrible*. And a lot of RAID cards frankly weren't, they offloaded a stack of the processing to the main CPU, with the result of fragile integration and poor performance. Real RAID cards became more and more difficult to find on hardware at about that time, cheapo onboard controllers were replacing RAID cards. And oh, lord, those MegaRAID chipsets weren't much better than Promise. I always had good success with 3Ware: they just worked, and they cooperated with Linux in getting the drivers working well.
See chapter 24 of the Release Notes for a full list. There are quite a few:
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/htm...
TYL,