The best way to do this is to run a truenas VM within proxmox and passthrough your HBA into the truenas VM. That will give truenas full control over any drive connected to that HBA. The performance overhead isn't that much so don't worry about it.
this post was submitted on 05 Jul 2023
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In a pinch passing through drives also works with ZFS, but obviously you lose SMART etc. I ran that for a few weeks before I managed to get ACS override working and my ZFS pool got picked up when TrueNAS started.
ZFS not have access to smart only works up until a drive starts acting up. Without SMART ZFS can't accurately determine if a drive is failing and lock the pool in order to prevent further data loss.
I'm aware, but I'm saying in a pinch it will work and when you pass your HBA fully you won't need to reconfigure anything, at least I didn't
thanks your suggestion made me find this thread, which I'll try when my new mobo ships: https://forum.proxmox.com/threads/sata-disk-passthrough-with-smart-functionality.65779/post-296310
(I want to avoid an HBA card for idle-power consumption reasons)
Yep, this is basically my plan once I finish my server.
There have been many posts about people running truenas as a VM in proxmox. There are a few things to consider that I'm not well versed on, so I suggest doing some more in depth research, but it's definitely possible (I did it myself up until the end of last year).
One of the easiest ways to get the hard drives into truenas is to connect them to a raid card running in IT mode, which allows the OS to directly control the drives (do not raid them, truenas wants the raw disks), and then pass the raid card to the truenas VM
Thanks, I tried googling around a bit, but didn't find anything until I looked for Hba-passthrought as suggested by antother comment.
I would like to avoid adding in a pci-card for now as I have enough SATA ports on my mobo and idle-power consumption is one of my main switching reasons, so I'll see if that works: https://forum.proxmox.com/threads/sata-disk-passthrough-with-smart-functionality.65779/post-296310
Oh my home NAS I started this way and it worked great. I only bought an HBA card because I needed more ports. Your mobo probably exposes your SATA controller as a PCI-E device that can be used via pass through in a VM. In my case I booted Proxmox off of NVME drive and passed my SATA controller to a Debian VM where I just use simple NFS and Samba for sharing and SnapRAID for drive parity (but TrueNas should work just as well).
I had zero issues with it and when I upgraded to an HBA card I just switched the drives to those ports and switched the PCIE device I was passing through and everything just worked (helps I always mount using partition UUIDs).
You might want to look into all-in-one zfs, which exports your pool as an NFS share internally and externally. In case you use spinning rust, L2ARC and ZIL are your friends.
My current setup is TrueNAS Scale in Proxmox, drives connected to HBA. Proxmox has ACS override enabled, HBA is passed to the VM.
Please, do yourself a favor and get an HBA. Do not get a PCIe SATA card, they are unreliable.
Wait, isn't a pcie sata card a HBA by design?
You may take this video from apalrd's adventures as a good reference. It is using a container instead of a VM so you can leverage Proxmox mount point to mount file system entities (e.g. ZFS datasets) to the container.
I am using a similar setup so I don't have to bother passing through all my HBAs or storage devices. My ZFS pools can live in the root OS, i.e. Proxmox, wtihout much hassle.
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