Adding rust mounts within a VM

[pickromanodd]

I'm running a VM where the boot drive is on ssd's. I'd like to have one of the directories on the OS be backed by my spinning rust pool. On lxc containers I can select a storage option and a path to mount it at within the container, how would I do something similar for a VM?

I may have attempted this in the past, I see two "Unused Disk" entries under Hardware (probably qcow2). When I double click them and "Add" them as SATA drives to the VM and reboot, I see them listed with fdisk -l, but I don't know how to mount those to a directory.

I'm using ZFS if that matters. I thought there might be a fancy way to just create a new dataset and map it as a subdirectory, but maybe that's just for lxc?

 

[Folke]

Hi,
you were almost there. After adding the disks you have to format them from the guest system. You are adding them as "virtual" hard drives, not as a preexisting directory structure, like you do on lxc. I found a good tutorial that goes from formatting to persistently mounting [0].
Currently it's not possible to mount a host directory directly into the vm, without the use of some protocol like nfs or smb, but I think that something like that is coming in a future release

[0] https://cloud.google.com/compute/docs/disks/format-mount-disk-linux