Add a PCI device, choose your NVMe controller, and make sure to check the 'PCI Express' checkbox. This checkbox is only available in a Q35 machine, and at least in my case was the key to making this work. Here's what mine looks like - this is my NVMe drive:
Thanks so much for the Q35 and pcie option hint, I was struggling on this for the last few hours, now everything works perfectly!
How to have DS3622xs recognize nvme SSD cache drive (Maybe works on other models).
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Thanks so much for the Q35 and pcie option hint, I was struggling on this for the last few hours, now everything works perfectly!