UNRAID 6.9 won't start after messing with IOMMU groups on new Ryzen build


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I've been trying to sort out issues with my new Ryzen 7 Unraid build for the past 2 days and I finally got it running. I then attempted to get my VMs working by following spaceinvader one's tutorials. I was messing with IOMMU groups (I'm a bit ignorant on the subject) and changed the PCIe ACS Override to "BOTH". Upon reboot, Unraid will not start up (see attached). I wish I could post diagnostics but I am unable to type any commands. This has been an endless headache. Please help.

20200630_163639.jpg

Edited by bubbleman441
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  • 1 year later...
  • 1 year later...
On 7/28/2021 at 4:55 PM, Starli0n said:

Ok I found the solution

I put the USB key to my computer and I restored the file:

/boot/config/vfio-pci.cfg.bak to /boot/config/vfio-pci.cfg

 

You are a life saver. I'm having networking issues and figured I'd try upgrading the bios. I forgot to enable IOMMU, and unraid booted fine. After enabling it, it would not boot. I made this change, and I can boot back in. Thank you.

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