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After wracking my brain for the New Years weekend and scouring both Xpe and Proxmox forums, I finally got IOMMU pass-through working for my LSI card. (Pay attention to the little details guys!!! The code goes on one line, one line!!!! It isn't delineated line by line. 😩 /rant) Prior to the PT fix, Proxmox was showing all of the 7 drives installed on the LSI PCI card. After pass-through obviously not as the Xpenology VM is accessing. However, upon logging into DSM I'm seeing some weird behavior and I don't even know where to begin so maybe someone has seen this before and can point me in the right direction. [Just as a side note, yes only 7 drives even though hard drive caddy and PCI card can support 8.] As you can see in the picture, drives are listed from 7-16. I am running two ssd's zfsmirror as the boot for Proxmox and image loader for VMs. I have 7 drives of 8 installed on the LSI 9211-8i PCI card. I see 4 of those drives as Drive 13-16. Drive 7 and 8 are the VM sata drives for the boot and loader information. Missing 3 on the other LSI SAS plug [assuming the three missing are all on the second SAS/SATA plug as it makes sense and it is port #2 on the card]. My guess is there is a max capacity of 16 drives in the DSM software. The mobo has a 6sata chipset (+2 NVME PCI/SATA unused), the two boot sata devices [drive 7 and 8] are technically virtual. 6 from the physical sata ports from chipset, +2 virtual sata for boot, +4 [of 8] from the LSI = the 16 spots listed. Is my train of thought on the right track? If so, my next thought then is, how do we block the empty [non-used] sata ports from the Chipset from taking up wasted space on the Xpe-VM? Like I said, I'm stuck. I need a helpful push in the right direction. Space below left for future editing of OP for any requested information.