weizhouapache commented on PR #8911:
URL: https://github.com/apache/cloudstack/pull/8911#issuecomment-2165254429

   I agree with @borisstoyanov 
   full clone will not save space, especially there are many vms having the 
same base image. this is probably why vms are deployed with linked clone, not 
full clone.
   it should be good to have a global setting to let users to determine if 
linked clone or full clone the volume during vm migration.  
   
   If linked clone is chosed, it is also feasible (I've done it some years ago)
   - copy the base image (template) from the original storage pool to new 
storage pool, if it is not present on the new pool
   - live-migrate the vm
   - change the base image of the volume after migration , by "qemu-img rebase 
-u -b <backingfile>"
   - just note the base image might be removed during vm migration by storage 
cleanup. be sure base image are not removed.


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