unRAID does not detect the NVMe drive installed in a new Glotrends PA20 card.

unRAID does detect the card, but not the drive.

The BIOS sees the card but not the drive.

I am starting troubleshooting. (i.e., switching drives, slots, PCIe slots, BIOS settings, contacting MB manufacturer, card manufacturer)

My system

Supermicro C7H170-M

Card: Glotrends PA20 that utilizes ASM2812 chipset.

Unraid 7.3.2

Diagnostics attached

tower-diagnostics-20260923-1417.zip

The diagnostics show that Unraid detects the NVMe controller behind the PA20, but it fails during initialization. This warning appears first:

pci 0000:06:00.0: can't set Max Payload Size to 256; if necessary, use "pci=pcie_bus_safe" and report a bug

Fatal PCIe errors follow, then the NVMe driver times out.

Before changing hardware, try one boot with pci=pcie_bus_safe:

1. Add pci=pcie_bus_safe to the existing append line for your normal boot entry. Keep the other parameters unchanged.

2. Reboot, then attach fresh diagnostics and report whether the SSD appears.

If it does not help, remove the parameter before further tests.

Please also provide the SSD’s exact make/model and which motherboard slot holds the PA20. The next useful comparison is that same SSD connected directly through a motherboard M.2 slot or a simple single-drive adapter. Shut down and disconnect power before moving hardware. No formatting or pool changes are needed for these detection tests.