Description of problem:
Sometimes, I want to clone thin logical volumes, to have two thin logical volumes be independent and not being able to merge them by accident.

For non-thin logical volumes, there is already an old open wishlist bug at https://bugzilla.redhat.com/show_bug.cgi?id=638188

For thin lvs, this can be done by the following commands:

  lvcreate -n vm2  --snapshot /dev/vg/vm1
  lvcreate -n vm1a --snapshot /dev/vg/vm1
  lvremove /dev/vg/vm1 
  lvrename /dev/vg/vm1a vm1 
  lvchange -kn /dev/vg/vm1
  lvchange -kn /dev/vg/vm2

This long list of commands is probably way to error-prone to be practical, when the only effective difference to a plain lvcreate --snapshot is the missing origin link.

Providing a shortcut like the command below to that should not be hard to implement:

  lvcreate -n vm2 --clone /dev/vg/vm1

thanks,
Uli