Background Info “delete source”: To move a disk, a copy on the new storage is created. Without the flag “delete source” the disk will still be attached as “unused”.
TODO do a cli version. Don't use the following code.
qm migrate .... --with-local-disks root@virth04:~ # qm migrate 1033 pxmx05 -migration_network 10.52.0.0/16 -migration_type insecure -targetstorage zfs