System Administration Guide: Virtualization Using the Solaris
Operating System   A clone is a writable copy of a virtual disk.
The default type of clone is a merged (that is, coalesced) copy
of the original virtual disk. An example of a merged clone
occurs when a virtual disk is comprised of several snapshots; a
subsequent clone operation results in a new virtual disk
containing no snapshots. A clone will be of the same type as the
original virtual disk (that is, vmdk:fixed). When a merged clone
is created there is no linkage back to the original virtual disk
or to any of its snapshots. This lack of linkage allows the
merged clone to be moved to another physical machine.  Create a
clone of the specified snapshot or virtual disk. The clone is
created with the type and option and the size of the virtual
disk being cloned. If clone_vdname includes a path, the
subdirectories from that path will be created during creation of
the cloned virtual disk. By default, a merged clone image is
created:  # vdiskadm clone [-