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Preface - I'm a Linux newbie! I have an 8TB external HDD, formatted NTFS. Windows Disk Management shows it as all one partition, but when I plug it into my unRAID box Unassigned Devices shows 2 partitions - the first as no file system and 0 B, the second as ntfs 8 TB. The 8 TB partition will mount, but I'd like to understand what's going on or if I'm doing something wrong. Thanks!

"Keep it in the family" makes sense. Not sure how I'm going to proceed. Thank you for all your help and insight!

amd_iommu=pt results in missing disks; they only show with iommu=pt. I was looking at the hardware compatibility list in the unRAID wiki, and assume I should avoid anything Marvell... do you think something like an LSI SAS 9201-8i HBA would work? Or is there a better one for use with the microserver Gen10?

Without iommu=pt, the disks are missing in the array.

I edited the config; HVM and IOMMU are both enabled. The USB card works in the VM. Shutdown/restart of the VM locks up the server. Requested files attached. About to hit submit and realized I haven't tried switching the bios; I'll try that next when I can, only so much time after work on weekdays unraidserver-diagnostics-20191004-0332.zip syslog.txt VMlog.txt

Bios is set to legacy; I vaguely recall reading somewhere that's what I should have it set to for this hardware and unRAID, but I can try switching it. I edited that config line so many times I can't believe I mistyped "iommo=on" and didn't catch it; but if it doesn't matter anyway I can remove it. I will try your steps as soon as I can; I appreciate the help as this is all new to me.

Unfortunately that's where I started: adding vfio-pci.ids=1b73:1100, which will passthrough to the VM, but restarting the VM crashes unRAID. After that I tried the different ACS override options in the VM Manager settings, and the unsafe interrupts, and combinations of both. I also tried pcie_acs_override=id:1b73:1100; everything leads to a server crash when restarting VM. Concerning the spam - I did have an ntfs external drive attached, and I think it was device sdg, but it's been unplugged since yesterday; I was trying the Libvert Hotplug USB plugin, so maybe it's related to that.

I tried different combinations of ACS override and unsafe interrupts to no avail; I undid all of that and the server is back to where is was (VM can be stopped and started at will but no USB controller). Thanks! unraidserver-diagnostics-20190929-1724.zip

Looking for any advice... I have a new microserver gen10, running the latest unRAID. I have a Windows VM working (WHS 2011, as it's the only ISO I have on hand and was eager to try out creating my first VM). I have a PCIe USB 3 card installed, which supports reset (SpaceInvader One's videos are invaluable!). I can passthrough the controller to the VM, and hot swap USB drives all day long/access them in the VM, that is until I stop the VM; If I try to start the VM again without rebooting the server first, unRAID freezes. I learned how to setup the syslog server, and save the log to a share, but nothing that seems to be related to the issue has a chance to get logged (that said I am a total Linux/unRAID noob so maybe I am missing something).