TrueNAS Virtualization Plans for 25.04.2

[Stux]

@NickF1227

Not an official response, just a point of fact. It should be theoretically possible to just use standard ZFS commands to copy the zvol for this reason among many other “DO AT YOUR OWN RISK” type reasons/solutions. I believe @Stux had a thread about this already somewhere.

Yes,

The link is:

HOWTO: Replace an Incus VM root device with an external zvol

In Fangtooth 25.04 RC.1 you can create Incus VM Instances using external zvol. This is a good way to migrate an existing VM into the Incus system, but you will be left with a dangling “root” 10GiB volume attached to your VM. There is no harm in this, and it uses a trivial amount of space, but perhaps it annoys you and your would prefer to replace the root disk with the external zvol, and fully migrate your VM into the Incus ecosystem. WARNING: Incus 6.0.3 LTS is prone to erasing existing zvol…

In essence though, you’d be wanting to do the exact opposite, which is fine, it means you can replicate, clone or move out.

And you want to then update the volmode and primary/secondary caches.

volmode gets changed to default, primarycache and secondarycache get changed to all

Its the volmode which will “activate” the zvol again after it gets moved/copied out of incus