In virt-manager, you want to take a live (online) snapshot of a running KVM virtual machine. Which disk image format must the guest's virtual disk use for the Snapshot button to be available and the operation to succeed?
vmdk
qcow2
raw
iso
virt-manager can only create live internal snapshots when the guest's disk is stored in the qcow2 format. qcow2 includes the metadata required to embed snapshot information inside the image, allowing libvirt to pause the guest, record its state, and resume it with minimal interruption. Raw images, ISO files, and converted VMDK images lack this embedded snapshot capability, so virt-manager disables the Snapshot interface when any of those formats are in use.
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