We want to clone our virtual disks before performing a software update. With RHEL 6.5 the QEMU guest virtual machine agent protocol is fully supported.
10.16.3. Creating a guest virtual machine disk backup  describes the process of how a snapshot request, or creating a backup copy of the disk is being done:
...the management stack (libvirt) sends a guest-fsfreeze-freeze QMP command to the QEMU GA via the virtio-serial port ...
guest-fsfreeze-freeze being automatically triggered when using "
- Red Hat Enterprise Linux 6.5
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