Proxmox 8.4 and TrueNAS 24.10 or 25.04 as iSCSI Target?

[SInisterPisces]

Hello,

Is there a guide for using TrueNAS 24.10 or 25.04 as an iSCSI target for Proxmox?

My understanding with older versions of TrueNAS/PVE was that ZFS over iSCSI (add a storage target that acts like a ZFS pool where you can put VM disks) was a bit of a non-starter because the TrueNAS templates didn't really handle it well. Is that still the case?

OTOH, I expect just adding individual zVols to use as virtual disks for VMs where those zVol iSCSI targets are created using the TrueNAS iSCSI wizard should work just fine--aside from leaving you with a huge pile of iSCSI targets visible in your Proxmox UI's storage section depending on how many VMs you have …

The guides I've found for this are all for older versions of PVE or TrueNAS and I'm hoping the current state of things is less gnarly.

 

[boomshankerx]

I'm currently using this plugin on Truenas 24.10. It works great.

There is currently a bug in 25.04 that we are trying to troubleshoot and are waiting for a response from the developer.

https://github.com/TheGrandWazoo/freenas-proxmox/tree/master

 

[SInisterPisces]

I'm currently using this plugin on Truenas 24.10. It works great.

There is currently a bug in 25.04 that we are trying to troubleshoot and are waiting for a response from the developer.

https://github.com/TheGrandWazoo/freenas-proxmox/tree/master

Thanks! I appreciate you posting; I came across that repo and from the date of the last release, assumed it was no longer in active development.

I'm not planning to upgrade to 25.04 anytime soon--there's nothing in it I desperately need right now--but I'm a bit wary of integrating the plugin into my Proxmox workflow if it can't be converted over to use websockets (the 25.04 replacement for the old API).

I think i'll try deploying it on Proxmox/TrueNAS this weekend just for testing.

I wonder how difficult it would be for Proxmox to implement the iSCSI protocol that's native to TrueNAS.

 

[SInisterPisces]

Update:

There's an issue open exploring Fangtooth 25.04 compatibility.
https://github.com/TheGrandWazoo/freenas-proxmox/issues/205

It doesn't look good right now. The OG dev, TheGrandWazoo, appears inactive. People much smarter than me who are looking at the code are suggesting that a complete rewrite will be needed to enable the use of websockets instead of the pre-Fangtooth API. Somehow, just depreciating the old API broke the plugin's ability to handle HTTP requests correctly, for one thing. There's a lot of detail in there with what's actually happening.

That sounds more like a fork/rewrite than an update.

I'm glad to see the TrueNAS devs looking at this. I'm considering opening a feature request on the PVE side of things, too.
EDIT:
After poking around a bit more, turns out there's an active Bugzilla ticket for TrueNAS ZFS-over-iSCSI compatibility here: https://bugzilla.proxmox.com/show_bug.cgi?id=1448

 

[boomshankerx]

We have made some progress patching the plugin to work on 25.04. @TheGrandWazoo has woken up and is working with us to troubleshoot.