A clonagem de um volume thin é tão simples quanto tirar um instantâneo do volume a ser clonado. Ao usar volumes finos, a captura instantânea e os novos volumes são realmente a mesma coisa, com diferentes sinalizadores padrão.
Dos documentos do kernel :
Once created, the user doesn't have to worry about any connection between the origin and the snapshot. Indeed the snapshot is no different from any other thinly-provisioned device and can be snapshotted itself via the same method. It's perfectly legal to have only one of them active, and there's no ordering requirement on activating or removing them both. (This differs from conventional device-mapper snapshots.)
Portanto, é perfeitamente legal fazer um instantâneo de um volume thin-provisioned para criar um clone CoW. Na página de manual :
Example Create first snapshot of an existing ThinLV: # lvcreate -n thin1s1 -s vg/thin1