[PVE-User] move virtual disk with snapshots

[Fabian Grünbichler]

On July 31, 2020 8:46 am, Roland wrote:
> hello,
> 
> can someone explain, why it's not possible in proxmox to move a VMs
> virtual disk with snapshots to a different datastore/dir - not even when
> offline?

because it only works from one storage type to the same storage type and 
even then requires custom code for each storage type for a rarely used 
operation.

> we need to fix some zfs dataset/dir naming/structure and can't as we
> would loose all our snapshots when moving VMs around...

if it's all ZFS, simply zfs send/recv a baseline (can be done while VMs 
are running), then poweroff and send the delta since the baseline, sed 
the storage name inside the config including all snapshots, start the VM 
again. with a bit of careful checking of involved VM configs before 
starting, the whole process can be automated if you want.

similar procedures, possibly with more downtime if no incremental 
sync option exists, apply to other storage types as well.

as always, test with a test VM/setup first, and do backups before just 
in case.