Alright. So here's where I'm at.
I have a HP DL380Gen8 and a Promise Vtrak j830s expander.
I grabbed this on amazon: https://www.amazon.com/dp/B01M9GRAUM, a LSI 9200-8E card. Had tons of NMI issues at POST when first installed. Flashed new firmware using this guide, and was able to get past boot. got Unraid to see the drive in the expander, but would have tons of NMI IOCKs, type 61 and 71 when writing to the drive. To test in a different machine, dropped the same card in a IBM System x3850, wasn't getting the NMI debug interrupts, but was getting lots of IO errors. Tested different drives, same result.
At this point, I'm convinced it's the card, or at least the card type i'm using.
Can anyone suggest a reliable external HBA that can be flashed to IT mode without making me want to rip my eyeballs out? As long as I can make a downstream connection over SFF-8088, i should be fine. Preferably, i'd like to go SFF-8088 on both ends, because that's what I have on hand, but i'm not above buying another cable/cable bundle in addition to a card.
Or maybe I did something stupid, and someone can call me out on that, and then I can move it to a general help topic elsewhere, but right now, just looking for advice on a good card for the system i'm running.
I'm burnt out lol.