For some reason, all but 1 drive was offline. Moving all 4 to empty bays resolved the problem, but I do need to figure out why 3 of the other 4 do not work anymore. Perhaps it is the SATA cables. Perhaps it is the controller. Perhaps it is the motherboard.
The previously-empty drive bays are plugged into a SATA to NVMe adapter on the bottom of the motherboard.
Things Attempted:
- Reseating Drives
- Reseating SATA cables (both ends)
- Rebooting server
- Moving to 4 empty drive bays (this is what worked)