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# virsh dumpxml GuestID > guest.xml

# virsh create configuration_file.xml 

create FILE [--console] [--paused] [--autodestroy]

Create a domain from an XML <file>. An easy way to create the XML <file> is to use the dumpxml command to obtain the definition of a pre-existing guest. The domain will be paused if the --paused option is used and supported by the driver; otherwise it will be running. If --console is requested, attach to the console after creation. If --autodestroy is requested, then the guest will be automatically destroyed when virsh closes its connection to libvirt, or otherwise exits.

Example

virsh dumpxml <domain> > domain.xml

vi domain.xml (or make changes with your other text editor)

virsh create domain.xml

define FILE

Define a domain from an XML <file>. The domain definition is registered but not started. If domain is already running, the changes will take effect on the next boot. 

$ sudo yum install kvm libvirt 

$ sudo yum install virt-manager

       --sparse=WHEN

              control creation of sparse files. See below

        By default, sparse SOURCE files are detected by a crude heuristic and the corresponding DEST file is made sparse as well.  That is the behavior selected by --sparse=auto.  Specify --sparse=always to create a sparse DEST file whenever the SOURCE file contains a long enough sequence of zero bytes.  Use --sparse=never to inhibit creation of sparse files.

       -S, --sparse

              Handle sparse files efficiently.  Some files in the file system may have segments which were actually never written (quite often these are database files created by such systems as DBM).  When given this option, tar attempts to determine if the file is sparse prior to archiving it, and if so, to reduce the resulting archive size by not dumping empty parts of the file.