[libvirt] clone "img" on iscsi storage

[Jason]

Hi:
   I need to clone a vm, the source is "vm1.img",i need to clone the "vm1.img" to a iscsi storage volume, it's said that i can't create volume on a iscsi. 
   I use  virStorageVolCreateXMLFrom to do this, can you do me a favor? thank you.
 the virt-manager can clone the "vm1.img" to overwrite the iscsi "lun",what can i do to do the same thing, i do not understand the python.
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