[SOLVED] PVE 9 - can't create snapshot on LVM thick

H

Hawk

New Member
Sep 8, 2025
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Hi.

I've updated some of PVEs to version 9 to test the new snapshot support for LVM thick storage. I've created the LVM storage which is shared among nodes in cluster, checked "Allow Snapshots as Volume-Chain" during storage creation, moved some VMs there and when I go to VM -> Snaphosts it just says "The current guest configuration does not support taking new snapshots".

I tried with both Linux and Windows VMs, simple ones with just one disk but still can't create snapshot. Is some other setting required to be able to create snapshots on LVM thick?

Here is sample VM config that I was testing:

Code: 
root@node4:~# qm config 104
agent: 1
bios: seabios
boot: order=scsi0
cores: 1
cpu: x86-64-v2-AES
memory: 2048
meta: creation-qemu=9.0.2,ctime=1724508706
name: linuxtest
net0: virtio=00:0c:29:41:da:35,bridge=vmbr0,tag=11
ostype: l26
scsi0: lunlvm:vm-104-disk-0,format=raw,size=20G
scsihw: virtio-scsi-single
smbios1: uuid=4b2d0cf6-e612-4bfd-a57c-c94267a85712
sockets: 1
vmgenid: a01e89a5-4b1b-49f4-ad53-7e561a8304de
 
You mean version of machine type? It is already set to "latest" for that VM. Tried changing from 9.0 to 10.0 on my Windows VM, but still can't create snapshots (same error).
 
Please share cat /etc/pve/storage.cfg.

Edit: It seems to require the QCOW2 format to work. You can simply move the virtual disk to the same storage to convert it.
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Last edited:
Hawk said:
You mean version of machine type? It is already set to "latest" for that VM. Tried changing from 9.0 to 10.0 on my Windows VM, but still can't create snapshots (same error).
Click to expand...
You are right, my mistake. I seem to remember the VM version being an issue before, but perhaps 9 stands for PVE9, not Qemu9. In this case 9 is latest.
@Impact has a good question to answer.

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
 
Yes, the disk of that VM was created quite a time ago on a local LVM thin storage (node1-data).

Code: 
lvmthin: node1-data
        thinpool node1-data
        vgname node1-data
        content images,rootdir
        nodes node1

dir: local
        path /var/lib/vz
        content iso
        prune-backups keep-all=1
        shared 0

dir: node1-local
        path /mnt/local
        content backup,vztmpl,iso
        nodes node1
        prune-backups keep-all=1
        shared 0

lvmthin: node4-ssd
        thinpool node4-ssd
        vgname node4-raid
        content images,rootdir
        nodes node4

lvmthin: node5-ssd
        thinpool node5-ssd
        vgname node5-raid
        content images,rootdir
        nodes node5

lvm: lunlvm
        vgname lunlvm
        content rootdir,images
        nodes node2,node3,node4,node5
        saferemove 0
        shared 1
        snapshot-as-volume-chain 1
 
Thanks. After changing disk format to qcow2 I was able to create snapshots, except for Windows VMs which have TPM "disk", but that is different problem explained in different thread.
 
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