I'm currently trying to passthrough a new GPU to a VM, which I understand means I need to enable IOMMU in the BIOS.

 

However, when I do this, any disks attached to my StarTech.com 8 Port SATA PCIe Card - PCI Express 6Gbps SATA Expansion Adapter Card with 4 Host Controllers - SATA PCIe Controller Card - PCI-e x4 Gen 2 to SATA III - SATA HDD/SSD (8P6G-PCIE-SATA-CARD) (4x ASM1182e controllers) no longer show in the array (so the array won't start). Disks not attached to that card (either directly to the motherboard or to another, different, SATA addin card) appear to be unaffected.

 

The system devices list shows the four controllers as being in the same IOMMU group:

IOMMU group 13:			 	...
	[1b21:0612] 05:00.0 SATA controller: ASMedia Technology Inc. ASM1061/ASM1062 Serial ATA Controller (rev 02)
 	[1b21:0612] 06:00.0 SATA controller: ASMedia Technology Inc. ASM1061/ASM1062 Serial ATA Controller (rev 02)
 	[1b21:0612] 07:00.0 SATA controller: ASMedia Technology Inc. ASM1061/ASM1062 Serial ATA Controller (rev 02)
 	[1b21:0612] 08:00.0 SATA controller: ASMedia Technology Inc. ASM1061/ASM1062 Serial ATA Controller (rev 02)

 

I've tried enabling each of the ACS override settings, which didn't help. I've tried swapping my GPU and the SATA PCIe card, which didn't help. I've tried adding "iommu=pt" to the syslinux config (as I read that online), which didn't help.

 

I'm at a total loss - I need to be able to pass through my GPU, but it seems like I can't even start my array with IOMMU enabled.

 

Thank you to anyone who can help.

 

Specs:

Motherboard: Gigabyte Technology Co., Ltd. B550 GAMING X (GPU is in PCIEX16, StarTech card is in PCIEX2).

Processor: AMD Ryzen 7 3700X 8-Core @ 3600 MHz

GPU: NVIDIA RTX 3050

 

bwd-ccn-hv01-diagnostics-20240610-2309.zip

This is a known issue with this controller, so you would need to disable IOMMU or get a different one.