[SOLVED] TrueNAS VM won't start after Proxmox Update

[Panik]

Hi all,

Just updated Proxmox VM from 7.2-3 to 7.2-11. Everthing seems fine other than my TrueNAS VM will not start.

I'm getting this error - TASK ERROR: cannot prepare PCI pass-through, IOMMU not present

TrueNAS has been running fine prior to the update.

Edit, I'm passing through SAS3008 controller. For the four 4TB hard drives. After reboot, the TrueNAS VM does not start due to this error, but I now can see the drives listed in the nodes "Disks" Section.

I must have done something when I originally set this up so Proxmox would not use or see them? I followed a walkthrough that I do not remember where.... The update must have switched something back?

Any help, greatly appreciated.

 

[leesteken]

I'm getting this error - TASK ERROR: cannot prepare PCI pass-through, IOMMU not present

The kernel version that came with early 7.2 had Intel IOMMU enabled by default, but this change (compared to earlier kernels) was reverted because it caused problems on some systems. Add intel_iommu=on to your kernel paramters (see the manual) and it will probably work well again.

 

[Panik]

Thanks @leesteken !! Problem solved. I thought it would be something simple.