Upgrade v8 to v9 and Disk for TrueNAS OS is gone

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dhenrickson

New Member
Sep 26, 2025
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Michigan
Hello,
I recently did an upgrade from v8 to v9 and everything came back with my windows VMs, but my TrueNAS Scale did not. Got that QEMU error with Code 1 showing. I can click on the VM and see that Hard Disk (scsi0) is showing Disk-0 instead of Disk-1 like all of the other VMs show for the OS system. How do I get that back? Did I lose everything and have to rebuild that or is there a fix for this? I have read through this forum, and people have fixed this, but their fixes did not work for me. Plus, there are a lot of assumptions that people are "pros" on this when asking questions and some of the solutions were missing steps for me. Any and all help would be greatly appreciated!
 

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Remove the virtual IOMMU from the VM (which you most likely don't need) and you'll be fine. There is a known issue with the aw-bits but I'm too lazy to search for it. The error message is quite clear and the vm-201-disk-0 is not abnormal and has nothing to do with it.
 
Last edited:
Hi @dhenrickson , welcome to the forum.

Disk naming (indexing) can and does vary across the VMs. Whether the boot disk is disk-0 or disk-1 is completely irrelevant.

As @leesteken quickly pointed while I was typing - the error message is unrelated to disks and has to do with the highlighted configuration setting.

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
 
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leesteken said:
Remove the virtual IOMMU from the VM (which you most likely don't need) and you'll be fine. There is a known issue with the aw-bits but I'm too lazy to search for it. The error message is quite clear and the vm-201-disk-0 is not abnormal and has nothing to do with it.
Click to expand...

Holy crap! that worked. So, the Virtual IOMMU worked in v8 when I set it up, but it does not work in v9? It might be clear to you, but I am just learning about this. I have only ever done OS to hardware systems. Proxmox is new new for me. I copies and pasted that error in Google and nothing that showed up suggested that I just remove that from the Machine settings. That was definitely a lot easier than trying to do what was suggested elsewhere in this forum. I appreciate your quick response and solid recommendation.
 
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