After the kernel change previously described snapshot-origin is there. $ sudo dmsetup targets snapshot-merge v1.0.0 snapshot-origin v1.7.0 snapshot v1.9.0 striped v1.3.0 linear v1.1.0 error v1.0.1 $ uname -a Linux quoll 2.6.32-5-amd64 #1 SMP Sun May 6 04:00:17 UTC 2012 x86_64 GNU/Linux