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Thx, that was it. But I can't remeber when I changed the vfio-pci config.

tower-diagnostics-20201024-1005.zip Here are the complete diagnostics

I have a system with 2 m.2 and 2 SSD which I use as cache devices. This was working for around 2 months. The other day one of the m.2 disappeared from the cache devices. The device is not visible within the device assignment. It's currently an empty slot with the name unassigned. I checked the Bios and both m.2 are visible there. When I go to Tools --> System Devices I also can find both m.2 IOMMU group 15:[144d:a808] 04:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983 IOMMU group 16:[144d:a808] 06:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983 The second one is just not selectable for device assignment. I checked the syslog (attachment) for myself, but could not find any errors related to the problem. Does anyone have an idea what the problem is? syslog.txt

I have two VM's on my Server which both use a dedicated GPU and run at the same time. I bought a KVM Switch which includes DisplayPort and USB Switch. I d like to be able to switch both my monitor and my USB peripherals, when pressing the KVM Button. The Monitor of course works fine. But I have trouble passing through the USB Devices. The KVM Switch also acts as hub. It seems Unraid only recognizes one Device when connected. The other problem I face is, that of course, the devices cannot be assigned to multiple running machines. I thought using a KVM Switch should be a common UseCase, am I missing something here? I checked the forums and the only option seems to be to buy two USB Controllers and pass them through. My Problem is, I do not have any space left for two USB Controller. Secondly, I don't wont anyone to just be able to plug USB aDevices to my machines.