Choosing the right vdev layout for my NAS build

Run lspci. Of course that requires the board…

Should be good enough.

As i understand it, a 4650G is second gen. Third would be a 5350G, 5650G, or 5750G; and fourth, 8000G.

The 4650G has 24 CPU lanes with 4 lanes reserved for the chipset. So 20 lanes on the CPU. With a x16 graphics card installed there are 4 lanes left for the M2_1 slot.

If I connect the HBA (PCI-e 2.0 x8) to this M.2 (PCI-e 3 x4) slot i’d be running at PCI-e 2.0 x4 speed which gives me 2GB/sec over 4 disks (in the future). That should be enough.

I’ve never taking this into consideration. Unfortunately you are right. The SATA controller does not have it’s own IOMMU group on this board. So that option is out.

I guess the way to go is to get a M.2-to-PCIe slot adapter and connect the HBA card to this. I still have to figure out which models are compatible with this board.

Thanks again. You’ve helped me a lot with getting my setup ready.

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It was quite difficult to find a M.2 M-key to PCI-e adapter for the HBA card (most parts are the other way around). But I managed to find this part:

DELOCK 64134
Specifications:

Connections:
    1 x 67-pin M.2 Key M connector
    1 x PCI Express x16, V3.0
    1 x 4-pin power connector
Interface: PCIe/NVMe
Form factor: M.2 2280
Wire gauge: 30 AWG
Bootable, UEFI version 2.3.1 or higher
Supports NVM Express (NVMe)
Length not including connectors: approx. 20 cm

Would it work to connect the Dell Perc H310i SAS/SATA HBA controller to it?

It should, provided that the HBA gets enough power—use additional power plugs.
Beware of the length and flexibility of the ribbon cable.

ADT-Link makes all sorts of adapters, including any custom length, and ships fast.