[pve-devel] [PATCH v2 pve-storage 1/2] add external snasphot support

[Fabian Grünbichler]

> Giotta Simon RUAGH via pve-devel <pve-devel at lists.proxmox.com> hat am 24.10.2024 09:59 CEST geschrieben:
> > I mean, if we don't allow .raw files to be snapshotted then this problem doesn't exist ;)
> 
> Quick comment from the bleacher; Adding a mechanism to shapshot raw disks might solve the TPM (tpmstate) snapshotting issue, as well as allowing containers to be snapshot.
> 
> For context: 
> When using a storage that does not natively support snapshotting (NFS on NetApp or similar enterprise storage, in particular), raw disks cannot be snapshot. 
> Since tpmstate disks can only be stored as raw (as I understand they are just a binary blob?), this makes it impossible to snapshot or (link-)clone any VMs that have a TPM. This especially is an issue for current Windows clients.
> Same issue for LXC containers, as their storage format is raw only as well.
>  
> https://bugzilla.proxmox.com/show_bug.cgi?id=4693

no it does not - with the mechanisms proposed in this patch series, only the initial volume can be raw, if it is snapshotted, the overlays are qcow2. so anything reading from the volume needs qcow2 support, including swtpm. that's why containers are not on the table for now either..