I wanted to put this out here for anyone who might have issues in the future. I spent too many hours today fighting with a Dell S5248F switch trying to uplink Dell R640 servers with QLogic 41262 NICs via twinax at 25Gb. Roughly 40% of the links failed to come up at 25Gb out of the box, with some ports randomly working occasionally. All interfaces came up when I forced the switchports to 10G mode only.
The fix was hard coding the QLogic NICs to 25G mode only via the NIC bios and setting the switchports to disable autonegotiation. It was a frustrating few hours trying to figure this one out. I'm sad to see autonegotiation issues making a comeback!
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