Linux KVM Virtualization Manual Low-Level Guest Export/Import Procedure
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Internal
Overview
Create a Snapshot Image
If the virtual machine has more than one storage device attached, they all must be snapshot at the same time to produce a consistent snapshot that can be reverted to.
Procedure
Shutdown the Target Guest
virsh shutdown <vm-name>
Identify all Storage Devices
virsh dumpxml <vm-name>
Look for <disk> definitions. The disk definition specifies the source of the virtual storage device.