Can I vgimport the target disk as /dev/vgtmp?
The drd mount command will vgimport the target disk, vgchange it to make it active, and mount all the file systems in the cloned volume group. However, these operations do not use the lvmtab on the clone itself. After booting the clone, you can also mount the original system image. (You can also vgimport the clone manually, but it is much easier to use the drd mount command.).