[PVE-User] Volume chain snapshotting

[Fiona Ebner]

Am 24.11.25 um 4:31 PM schrieb DERUMIER, Alexandre via pve-user:
> 
> Hi Mark !
> 
>>> 1: Are there plans to make it possible to convert existing LVM Backed
>>> storages with images that already exist? Or is there an idea how we
>>> can convert existing images?
> 
> It should be possible to use move disk to do it. (Define same storage
> twice, without volume-chain  and another with with-volume chain, and
> move to qcow2).

Please don't! This can break shared LVM storages because it fails to
honor locking guarantees! LVM metadata corruption is possible with
concurrent operations and Proxmox VE won't be aware of it actually being
the same storage under the hood.

> Alternatively, I think it could be possible to simply enable it on your
> current storage (in storage.cfg directory), and do the move disk to
> qcow2 format.
> (but be carefull to not have existing internal snapshots, as it's not
> supported to have both kind of snapshots at the same time)

You can also just enable the flag for an existing LVM storage via the
web UI/API/CLI, no need for manual editing. You will not be able to
disable the flag anymore as long as qcow2 formatted images exist
however. Moving disks to the same storage while changing formats is a
possibility, yes.